Effect of Ca and Zr Additions and Aging Treatments on Microstructure and Mechanical Properties of Mg-Sn Alloy

2020 ◽  
Vol 993 ◽  
pp. 152-160
Author(s):  
Fan Wang ◽  
Yun Feng ◽  
Ming Shi Li ◽  
Xin Ying Teng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Brinell Hardness ◽  
Simple Substance ◽  
Maximum Tensile Strength ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Microstructure And Mechanical Properties ◽  
Brittle Phase ◽  
The Difference

The effect of Ca and Zr Additions and Aging Treatments on Microstructure and Mechanical Properties of Mg-Sn alloy was investigated. It was found that the grain size of as-cast Mg-4Sn-xCa and Mg-4Sn-xZr alloys was refined with the increase of alloying elements addition. The alloys were solution-treated at 480 °C and aged at 160 °C, and the aging peak appeared after 4-5 h. The difference was that the maximum tensile strength and Brinell hardness of Mg-4Sn-0.3Ca were 140.7 MPa and 44.5 HB, respectively, while in Mg-4Sn-xZr alloy, Mg-4Sn-0.5Zr was optimal. The maximum tensile strength and Brinell hardness of Mg-4Sn-0.5Zr were 137.4 MPa and 41.5 HB, respectively. This difference was mainly due to the formation of the brittle phase CaMgSn in the Mg-4Sn-xCa alloy. The excessive brittle phase was not conducive to the strength of the alloy, but could increase the hardness of the alloy. However, Zr existed as a simple substance in the alloy, which can be used as a nucleation particle to inhibit grain growth and play a role of fine grain strengthening. But the addition of Zr did not form many hard phases, so the hardness did not change much.

Formation of Ni3Nb and Influence of Y2O3 on Mechanical Properties of Nano-Grained Ni20Cr20Fe5Nb1Y2O3 Alloy

2006 ◽  
Vol 306-308 ◽  
pp. 929-934
Author(s):  
Il Ho Kim ◽  
Yong Hwan Kim
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Grain Boundary Sliding ◽  
Mechanically Alloyed ◽  
Subsequent Aging ◽  
Fine Grain ◽  
Conventional Heat Treatment ◽  
Dislocation Movement ◽  
The Difference

The effects of adding Y2O3, and the precipitation of Ni3Nb by heat treatment, on the mechanical properties of mechanically alloyed Ni20Cr20Fe5Nb alloy were studied. The addition of Y2O3 caused an increase in the tensile strength at room temperature, 400°C and 600°C. The difference in the tensile strength between the Ni20Cr20Fe5Nb and Ni20Cr20Fe5Nb1Y2O3 alloys decreased gradually with increasing test temperature. The tensile strength of the Ni20Cr20Fe5Nb1Y2O3 alloy at relatively low temperature was increased by the addition of Y2O3, but decreased abruptly at temperature above 600°C. This seems to result from a change in the deformation mechanism due to the ultra-fine grain size, that is, grain boundary sliding is predominant at temperatures above 600°C while internal dislocation movement is predominant at temperatures below 600°C. Following the conventional heat treatment of the solution and subsequent aging, only a small amount of δ(Ni3Nb) phase was formed in the Ni20Cr20Fe5Nb alloy, whereas in a previous report it was indicated that a large amount of γ″(Ni3Nb) was formed in IN 718 alloy. The small amount of δ(Ni3Nb) phase formed in the present case is due to the exhaustion of the Nb content resulting from the formation of NbC during consolidation.

Microstructure and Mechanical Properties of Brazed Tungsten/Steel Joint for Divertor Applications

2014 ◽  
Vol 789 ◽  
pp. 384-390 ◽  
Author(s):  
Yun Zhu Ma ◽  
Qing Shan Cai ◽  
Wen Sheng Liu ◽  
Shu Hua Liu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Performance ◽  
Testing Machine ◽  
Chromium Steel ◽  
Steel Joint ◽  
Thermal Expansion Coefficients ◽  
Microstructure And Mechanical Properties ◽  
Brazed Joint ◽  
The Difference

Due to its excellent thermophysical properties, tungsten has been used as structural materials for divertor components of fusion reactors. With the development of technology, the helium cooled high performance divertor requires the high reliable joining between tungsten and ferritic martensitic high chromium steel. However, the difference of thermal expansion coefficients between tungsten and steel causes high thermally residual stresses, which will yield failure of the joint. Therefore, the preparation of the joint between tungsten and steel is a key issue for divertor application. A brazing process, using rapidly solidified Ni-based foil-type filler and a vanadium slice as intermediate materials, was developed to investigate the joining of tungsten and steel for divertor components, and the microstructure and mechanical properties of the joint were also studied. The elements and phases compositions in the boning regions were analyzed by electron probe microanalysis and X-ray diffraction. Micro-hardness distribution and tensile strength of joint were measured by nanoindenter and mechanical testing machine, respectively. The results indicated that the integral bonding was achieved at the bonding regions of the brazed joint. The typical microstructure of the joint was consisted of W/V and V/steel brazed seams separated by a V slice. The hard and brittle vanadium borides with 25 GPa hardness were produced at the W/V and V/steel brazed seams. The as-bonded W/steel joint with tensile strength of 143MPa was obtained, and specimens appeared a brittle fracture mode and fractured in the brittle vanadium boride layers during tensile testing.

scholarly journals Influence of the Anisotropy on the Microstructure and Mechanical Properties of Ti/Al Laminated Composites

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3556 ◽  
Author(s):  
Tao Huang ◽  
Zhuo Song ◽  
Fuxiao Chen ◽  
Junqing Guo ◽  
Yanbo Pei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Bond Strength ◽  
Laminated Composites ◽  
Rolling Direction ◽  
Preferential Orientation ◽  
Anisotropic Behavior ◽  
Microstructure And Mechanical Properties ◽  
Properties Of Materials ◽  
The Difference

Anisotropy is the difference in the microstructure or mechanical properties of materials in different directions. Anisotropic behavior occurs in rolled sheets, and this anisotropy is very obvious in laminated composites. In this work, the influence of anisotropy on the microstructure and mechanical properties of Ti/Al laminated composites fabricated by rolling was investigated. The results show that the microstructure and mechanical properties of the Ti/Al laminated composites were obviously anisotropic. The grains in the Al layer of the composites were elongated along the rolling direction and were compressed perpendicular to the rolling direction. The grains in the Ti layer of the composites had no obvious preferential orientation and comprised mainly twins. With the rolling direction as 0°, the mechanical properties of the Ti/Al laminated composites varied greatly as the angle of the composites increased. The tensile strength, elongation and bond strength of the Ti/Al laminated composites decreased with increasing angle of the composites. In addition, the microhardness of the Ti/Al laminated composites increased with increasing angle of the composites.

Microstructure and Mechanical Properties of Backward-Extruded Mg-Zn-xCa Biomaterials

2013 ◽  
Vol 747-748 ◽  
pp. 426-430
Author(s):  
Xue Jun Li ◽  
Hui Li ◽  
Shuang Shuang Zhao ◽  
Ning Ma ◽  
Qiu Ming Peng
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Solid Solution Strengthening ◽  
Backward Extrusion ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Microstructure And Mechanical Properties ◽  
Solution Strengthening ◽  
Extrusion Technology ◽  
Precipitate Strengthening

The Mg-1.0Zn-xCa (x=0.2, 0.5, 0.8, 1 wt. %) alloys were prepared by zone solidification and backward extrusion technology. The microstructure and mechanical properties of backward-extruded Mg-1.0Zn-xCa alloys were investigated. The results showed that these backward-extruded Mg-1.0Zn-xCa alloys were mainly composed of equi-axed pentagon-shaped grains and some Mg0.9Zn0.03 precipitates. The tensile and compressive strengths of backward-extruded Mg-1.0Zn-xCa alloys were greatly improved. The improved mechanical properties are mostly attributed to fine grain strengthening, solid solution strengthening and precipitate strengthening. The results demonstrated that the micro alloying of Ca element was one of effective method to improve the mechanical properties of Mg-1.0Zn based biomaterials.

Effect of Welding Wires on Microstructure and Mechanical Properties of CO2 Shielded Arc Welding Welded Joint of 30CrMnSiA Steel

2014 ◽  
Vol 508 ◽  
pp. 30-34 ◽  
Author(s):  
He Chen ◽  
Cheng Gang Yang ◽  
Ai Wu Yu ◽  
Qiang Zheng ◽  
Xiao Bin Yu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Weld Metal ◽  
Acicular Ferrite ◽  
Arc Welding ◽  
Welded Joint ◽  
Bending Properties ◽  
Fine Grain ◽  
Microstructure And Mechanical Properties ◽  
Proeutectoid Ferrite

30CrMnSiA steel is welded by CO2 shielded arc welding with H08Mn2SiA and Ok Aristorod 12.5 welding wire respectively. The effect of welding compositions on the microstructure and mechanical properties of welded joint are studied. The results show that using Ok Aristorod 12.5 for welding, the microstructures of weld metal are mainly composed of acicular ferrite, proeutectoid ferrite and pearlite, the tensile strength of the welded joint is poor. When using H08Mn2SiA for welding, the microstructures of weld metal are mainly composed of fine grain ferrite and acicular ferrite, the acicular ferrite is refined and the content of acicular ferrite is increased, so the tensile strength of the welded joint is improved. Using these two welding wires are welded, the joints both have excellent bending properties.

Microstructure and Mechanical Properties of High Densification Mo/Cu Composites

2007 ◽  
Vol 353-358 ◽  
pp. 2883-2886 ◽  
Author(s):  
Guo Qin Chen ◽  
Gao Hui Wu ◽  
Long Tao Jiang ◽  
De Zhi Zhu ◽  
Dong Li Sun
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Squeeze Casting ◽  
Brinell Hardness ◽  
Cost Effective ◽  
Reaction Products ◽  
Casting Technology ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
The Cost

Microstructure and mechanical properties of the 55%, 60% and 67% Mo/Cu composites for electronic packaging application fabricated by a patent squeeze casting route have been investigated. The results show that Mo particles are homogeneously distributed in the matrix, and the Mo-Cu interfaces are clean, free from interfacial reaction products and amorphous layers. The densification of the Mo/Cu composites is higher than 99%. The as-received composites exhibit a Brinell hardness varying from HB178.1 to HB196.9 and an elastic modulus varying from 177GPa to 213 GPa. The tensile strength of the composites is higher than 480MPa. Moreover, the composites display favorable plasticity, while the elongation of the 55% Mo/Cu composite is as high as 5%. Obtaining high tensile strength and elongation in the composite is attributed to the high densification, as well as the clean and smooth Mo-Cu interfaces, both resulting from the cost-effective squeeze-casting technology.

Effect of silver nitrate on some mechanical properties of heat polymerizing acrylic resins

2019 ◽  
Vol 14 (1) ◽  
pp. 110
Author(s):  
Assiss. Prof. Dr. Sabiha Mahdi Mahdi ◽  
Dr. Firas Abd K. Abd K.
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Silver Nitrate ◽  
Surface Hardness ◽  
Mechanical Tests ◽  
Hardness Tester ◽  
Acrylic Resins ◽  
The Difference

Aim: The aimed study was to evaluate the influence of silver nitrate on surfacehardness and tensile strength of acrylic resins.Materials and methods: A total of 60 specimens were made from heat polymerizingresins. Two mechanical tests were utilized (surface hardness and tensile strength)and 4 experimental groups according to the concentration of silver nitrate used.The specimens without the use of silver nitrate were considered as control. Fortensile strength, all specimens were subjected to force till fracture. For surfacehardness, the specimens were tested via a durometer hardness tester. Allspecimens data were analyzed via ANOVA and Tukey tests.Results: The addition of silver nitrate to acrylic resins reduced significantly thetensile strength. Statistically, highly significant differences were found among allgroups (P≤0.001). Also, the difference between control and experimental groupswas highly significant (P≤0.001). For surface hardness, the silver nitrate improvedthe surface hardness of acrylics. Highly significant differences were statisticallyobserved between control and 900 ppm group (P≤0.001); and among all groups(P≤0.001)with exception that no significant differences between control and150ppm; and between 150ppm and 900ppm groups(P>0.05).Conclusion: The addition of silver nitrate to acrylics reduced significantly the tensilestrength and improved slightly the surface hardness.

scholarly journals Effect of Sm Doping on the Microstructure, Mechanical Properties and Shape Memory Effect of Cu-13.0Al-4.0Ni Alloy

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4007
Author(s):  
Qimeng Zhang ◽  
Bo Cui ◽  
Bin Sun ◽  
Xin Zhang ◽  
Zhizhong Dong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Shape Memory Effect ◽  
Memory Effect ◽  
Strengthening Effect ◽  
Face Centered Cubic ◽  
Compressive Fracture ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Face Centered

The effects of rare earth element Sm on the microstructure, mechanical properties, and shape memory effect of the high temperature shape memory alloy, Cu-13.0Al-4.0Ni-xSm (x = 0, 0.2 and 0.5) (wt.%), are studied in this work. The results show that the Sm addition reduces the grain size of the Cu-13.0Al-4.0Ni alloy from millimeters to hundreds of microns. The microstructure of the Cu-13.0Al-4.0Ni-xSm alloys are composed of 18R and a face-centered cubic Sm-rich phase at room temperature. In addition, because the addition of the Sm element enhances the fine-grain strengthening effect, the mechanical properties and the shape memory effect of the Cu-13.0Al-4.0Ni alloy were greatly improved. When x = 0.5, the compressive fracture stress and the compressive fracture strain increased from 580 MPa, 10.5% to 1021 MPa, 14.8%, respectively. When the pre-strain is 10%, a reversible strain of 6.3% can be obtained for the Cu-13.0Al-4.0Ni-0.2Sm alloy.

scholarly journals Effect of Nano-Y2O3 Addition on Microstructure and Tensile Properties of High-Nb TiAl Alloy Prepared by Spark Plasma Sintering

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1048
Author(s):  
Yingchao Guo ◽  
Yongfeng Liang ◽  
Junpin Lin ◽  
Fei Yang
Keyword(s):  
Tensile Strength ◽  
Spark Plasma Sintering ◽  
Tial Alloy ◽  
Second Phase ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Y2o3 Addition ◽  
Powder Metallurgy Route

Nano-Y2O3 reinforced Ti-47.7Al-7.1Nb-(V, Cr) alloy was fabricated by a powder metallurgy route using spark plasma sintering (SPS), and the influence of nano-Y2O3 contents on the microstructure and mechanical properties were investigated systematically. The results revealed that the ultimate tensile strength and elongation of the alloy were 570 ± 28 MPa and 1.7 ± 0.6% at 800 °C, 460 ± 23 MPa and 6.1 ± 0.4% at 900 °C with no nano-Y2O3, 662 ± 24 MPa and 5.5 ± 0.5% at 800 °C, and 466 ± 25 MPa and 16.5 ± 0.8% at 900 °C with 0.05 at% nano-Y2O3 addition, respectively. Due to the fine-grain strengthening and the second-phase strengthening, both tensile strength and elongation of the high-Nb TiAl alloy were enhanced with the addition of nano-Y2O3.

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