The outstanding tensile strength of Ni-rich high entropy superalloy fabricated by powder metallurgical process

2019 ◽  
Vol 235 ◽  
pp. 121749 ◽  
Author(s):  
Byungchul Kang ◽  
Taeyeong Kong ◽  
Ho Jin Ryu ◽  
Soon Hyung Hong
Keyword(s):  
Tensile Strength ◽  
Metallurgical Process ◽  
High Entropy ◽  
Powder Metallurgical Process

scholarly journals A Novel Non-Equiatomic (W35Ta35Mo15Nb15)95Ni5 Refractory High Entropy Alloy with High Density Fabricated by Powder Metallurgical Process

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1436
Author(s):  
Bohua Duan ◽  
Yingrui Yu ◽  
Xinli Liu ◽  
Dezhi Wang ◽  
Zhuangzhi Wu
Keyword(s):  
Mechanical Alloying ◽  
Fracture Strain ◽  
Oxide Inclusion ◽  
High Density ◽  
High Entropy Alloy ◽  
Metallurgical Process ◽  
High Entropy ◽  
Powder Metallurgical Process ◽  
Plasma Sintering ◽  
Spark Plasma

A non-equiatomic refractory high entropy alloy (RHEA), (W35Ta35Mo15Nb15)95Ni5 with high density of 14.55 g/cm3 was fabricated by powder metallurgical process of mechanical alloying (MA) and spark plasma sintering (SPS). The mechanical alloying behavior of the metallic powders was studied systematically, and the microstructure and phase composition for both the powders and alloys were analyzed. Results show that the crystal consists of the primary solid solution and marginal oxide inclusion (Nb5.7Ni4Ta2.3O2). In addition, the maximum strength, yield strength and fracture strain are, 2562 MPa, 2128 MPa, 8.16%, respectively.

Fabrication of Cu-Al2O3 Composites by Simplified Internal Oxidation Process

2010 ◽  
Vol 148-149 ◽  
pp. 416-419
Author(s):  
Bao Hong Tian ◽  
Cheng Dong Xia ◽  
Shu Guo Jia
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Internal Oxidation ◽  
Oxidation Process ◽  
Hot Extrusion ◽  
Softening Temperature ◽  
Copper Matrix ◽  
Dispersion Strengthening ◽  
Powder Metallurgical Process ◽  
Thermal Stability Of

Cu-Al2O3 composites were prepared by a new simplified internal oxidation process integrating with powder metallurgical process, and then the hot extrusion and the cold rolling processes were carried out. The microstructure, electrical conductivity, hardness, tensile strength and thermal stability of the composites were investigated. The results show that Cu-Al2O3 composites were fabricated successfully by the simplified process in which internal oxidation completed during the sintering. There are a mass of fine Al2O3 particles in size varying from 5 nm to 20nm dispersed in copper matrix after sintering 950 for 4h. After sintered at 950 for 4h and extruded at 950 followed with the cold deforming of 80%, the electrical conductivity, hardness, tensile strength and softening temperature of composite reach 81％IACS, 137HV, 561MPa and 850 respectively. It is considered that the dispersion strengthening and strain hardening have greatly contribution to the Cu-Al2O3 composites fabricated with the simplified process.

scholarly journals High-entropy Al0.3CoCrFeNi alloy fibers with high tensile strength and ductility at ambient and cryogenic temperatures

2017 ◽  
Vol 123 ◽  
pp. 285-294 ◽  
Author(s):  
Dongyue Li ◽  
Chengxin Li ◽  
Tao Feng ◽  
Yidong Zhang ◽  
Gang Sha ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Cryogenic Temperatures ◽  
High Tensile Strength ◽  
High Entropy ◽  
Strength And Ductility

Effect of Sintering Condition on Tensile Strength of Fe-based Non-equiatomic High Entropy Alloy

2021 ◽  
Vol 28 (3) ◽  
pp. 221-226
Author(s):  
Namhyuk Seo ◽  
Junhyub Jeon ◽  
Gwanghun Kim ◽  
Jungbin Park ◽  
Seung Bae Son ◽  
...  
Keyword(s):  
Tensile Strength ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Sintering Condition

scholarly journals Microstructure and Mechanical Property Evolution during Annealing of a Cold-Rolled Metastable Powder Metallurgy High Entropy Alloy

Entropy ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 833 ◽  
Author(s):  
Li ◽  
Qiu ◽  
Guo ◽  
Liu ◽  
Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Tensile Strength ◽  
Powder Metallurgy ◽  
Cold Deformation ◽  
Precipitation Strengthening ◽  
High Entropy Alloy ◽  
Σ Phase ◽  
High Entropy ◽  
Fine Grain

Precipitation strengthening is an effective approach to strengthen high-entropy alloys (HEAs) with a simple face-center-cubic (FCC) structure. In this work, CoCrFeNiMo0.2 HEAs were prepared by powder metallurgy, followed by cool rolling and subsequent heat-treatment at different temperatures. The effects of cold working and annealing on microstructure and mechanical properties have been investigated. Results show the fine and dispersed (Cr, Mo)-rich σ phase with a topologically close-packed structure precipitated in the FCC matrix after the prior cold deformation process, which enhanced the mechanical property of the CoCrFeNiMo0.2 alloy. The HEA annealed at 600 °C for 48 h had a tensile strength of 1.9 GPa but an elongation which decreased to 8%. The HEA annealed at 800 °C for 12 h exhibited a tensile strength of 1.2 GPa and an elongation of 31%. These outstanding mechanical properties can be attributed to precipitation strengthening and fine-grain strengthening.

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