Microstructural Characterization and Properties of Sn-Ag-Cu (SAC) Compound Induced by Zn Alloying

2017 ◽  
Vol 16 ◽  
pp. 33-36 ◽  
Author(s):  
Stewart M. Go Roa ◽  
Eduardo Magdaluyo Jr. ◽  
Wojciech Gierlotka
Keyword(s):  
Structural Analysis ◽  
Vickers Hardness ◽  
Microstructural Characterization ◽  
Minimal Amount ◽  
Microstructural Properties ◽  
Constant Composition ◽  
Vickers Hardness Number ◽  
Hardness Number ◽  
Fine Microstructure

The microstructural properties and intermetallic (IMC) formation of Sn-Ag-Cu (SAC) through varying amounts of zinc were examined in this study while having tin held at constant composition. Samples were prepared and heated in a furnace for 168 hours to achieve complete solidification and homogenization. Results showed relatively fine microstructure primarily containing Sn dendrites, eutectic, and pro-eutectic phases. Microstructures for each alloy was similar for which majority of them formed copper-based IMCs and Sn dendrites. The alloy (0.7Sn-0.15Ag-0.1Cu-0.05Zn) containing minimal amount of zinc with high amount of Ag resulted to high Vickers hardness number. Structural analysis showed that these group of alloys composed mainly of β-Sn, Cu6Sn5, and Ag3Sn.

Contact Rigidity at Tool Shank of Turning Tools

1987 ◽  
Vol 109 (2) ◽  
pp. 169-172 ◽  
Author(s):  
E. Marui ◽  
S. Ema ◽  
S. Kato
Keyword(s):  
Experimental Investigation ◽  
Contact Area ◽  
Vickers Hardness ◽  
Flexural Rigidity ◽  
Vickers Hardness Number ◽  
Empirical Expressions ◽  
Contact Rigidity ◽  
Hardness Number ◽  
Tool Shank

This paper presents an experimental investigation of the contact rigidity between a turning tool shank and tool post. The contact rigidity is influenced by the flexural rigidity of tool shank, contact area in the tool shank and the Vickers hardness number of the shank material. The effects of these parameters on the contact rigidity are estimated by simple empirical expressions.

scholarly journals Evaluation of Vickers Hardness Number of Al-Si Alloy Under Heat Treated Conditions

2021 ◽  
Vol 10 (6) ◽  
pp. 222-227
Author(s):  
Jayasheel Kumar K A ◽  
◽  
C M Ramesha ◽  
Keyword(s):  
Heat Treatment ◽  
Vickers Hardness ◽  
Precipitation Hardening ◽  
Heat Treatment Condition ◽  
Vickers Hardness Number ◽  
Hardness Tester ◽  
Hardness Number ◽  
Heat Treated ◽  
Hardness Property ◽  
Property Assessment

The paper deal with the hardness property assessment of various Al-Si alloys under heat treated conditions. The tested specimens have the compositions of Si with percentages such as 12 18 and 24. The fabrication of the selected composition is carried out by melting the material to the melting temperature of around 800°C. The material is subjected to solutionised heat treatment for 3 hours at 500°C, 520°C and 535°C and quenched in water. Further aging is carried out at 155°C for 2 hours, 5 hours and 8 hours respectively for 500°C, 520°C and 535°C of solution heat treatment condition. The hardness property is evaluated using Vickers Hardness tester as per the standards of ASTM- E92. Thorough comparison of Vickers hardness number is performed among the as- cast and various heat treated environment. Desirable properties of alloy are observed at 520°C solutionised heat treatment & 5 hours of precipitation hardening at 155°C for 18% of Silicon composition. The hardness value decreases due to the increase in percentage of silicon and the values are observed.

Effects of gamma radiation on poly(methyl methacrylate)/single-wall nanotube composites

2002 ◽  
Vol 17 (10) ◽  
pp. 2507-2513 ◽  
Author(s):  
P. A. O'Rourke Muisener ◽  
L. Clayton ◽  
J. D'Angelo ◽  
J. P. Harmon ◽  
A. K. Sikder ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Vickers Hardness ◽  
Radiation Effects ◽  
Pure Pmma ◽  
Vickers Hardness Number ◽  
Poly Methyl Methacrylate ◽  
Hardness Number ◽  
The Matrix ◽  
Nanotube Composites

Single-wall carbon nanotube (SWNT)/poly(methyl methacrylate) (PMMA) composites were fabricated and exposed to ionizing radiation for a total dose of 5.9 Mrads. Neat nanotube paper and pure PMMA were also exposed for comparison, and nonirradiated samples served as controls. A concentration of 0.26 wt% SWNT increased the glass transition temperature (Tg), the Vickers hardness number, and modulus of the matrix. Irradiation of the composite did not significantly change the Tg, the Vickers hardness number, or the modulus; however, the real and imaginary parts of the complex permittivity increased after irradiation. The dielectric properties were found to be more labile to radiation effects than mechanical properties.

Vickers Microhardness Dependence Load and Determining of Tensile Strength of HQ 705 Steel from Microhardness Curves

2016 ◽  
Vol 842 ◽  
pp. 43-52 ◽  
Author(s):  
Viktor Malau ◽  
Latif Arifudin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Alloy Steel ◽  
Vickers Hardness ◽  
Vickers Microhardness ◽  
Hardness Test ◽  
Indentation Load ◽  
Holding Time ◽  
Raw Material ◽  
Vickers Hardness Number

Vickers microindentation hardness test has been applied for a long time to determine the mechanical properties of a small volume of samples. The procedure of this hardness test consists of using a constant load on a rigid indenter and measuring the dimensions of the indenter residual impression (indentation imprint) on the surface of the sample tested after loading and unloading. The objective of this research is to characterize the mechanical properties and material constants of HQ (High Quality) 705 alloy steel mainly its VHN (Vickers Hardness Number) and tensile strength before and after quenching and tempering heat treatments. The characterization is based on Vickers microhardness dependence load curves.Quenching treatment was performed in a furnace by heating the samples at austenite temperature of 850 o C with holding time of two hours and then the samples were rapidly cooled in oil bath. Tempering processes were conducted by heating again the quenching samples to temperatures of 150, 200, 250, 300, 350, 400, 450, 500, 550 and 600 o C with holding time of two hours for each sample. Finally, all samples were slowly cooled in atmospheric temperature. The mechanical properties of samples were characterized by using Vickers microhardness dependence load curves.The results show that VHN (Vickers Hardness Number) depends on indentation load and VHN increases with increment of load for indentation load lower than 5 N. VHN is almost constant for indentation load greater than 5 N. The raw material (without heat treatment) has the VHN and tensile strength of 3413 MPa and 1050.61 MPa respectively and the quenched samples have the VHN and tensile strength of 5407 and 1861 MPa respectively. The Vickers hardness and tensile strength decrease with the increment of tempering temperatures. The higher tempering temperature produces lower hardness and tensile strength. The raw material tensile strength of 1058.8 MPa obtained by tensile test is comparable to its tensile strength of 1050.61 MPa obtained by Vickers indentation. This result indicates that Vickers microindentation is valid to use for evaluating the tensile strength of HQ 705 alloy steel.

scholarly journals Influence of Plastic Deformation on Microstructural Evolution of 100Cr6 Bearing Ring in Hot Ring Rolling

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4355
Author(s):  
Guanghua Zhou ◽  
Wenting Wei ◽  
Qinglong Liu
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Microstructural Evolution ◽  
Vickers Hardness ◽  
Microstructural Characterization ◽  
Lamellar Spacing ◽  
Rolling Process ◽  
Rolling Reduction ◽  
Ring Rolling ◽  
Bearing Rings

The hot ring rolling technology as the crucial procedure for the manufacture of bearing rings plays an important role in determining the final microstructure of bearing rings. In this work, the influence of the hot ring rolling process on the microstructural evolution of 100Cr6 bearing rings was investigated using a three-dimensional (3D) numerical model and microstructural characterization. It was found that the significant microstructural refinement occurs at the different regions of the rings. However, owing to the non-uniform plastic deformation of hot rolling, the refinement rate of grain size and decrease of pearlite lamellar spacing (PLS) also showed uniformity at different regions of the rings. Furthermore, the degree of grain refinement had been limited with the increase of rolling reduction. Due to the refined grain size and decreased PLS, the Vickers hardness increased with the increase of rolling reduction. Moreover, the Vickers hardness from the outer surface to the inner surface of the ring is asymmetrical u-shaped, which had the law of lower hardness in the center area and higher hardness on the surface.

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