Microstructure and Properties of Dilute Cu-Nb Alloy Prepared by Mechanical Alloying

2017 ◽  
Vol 729 ◽  
pp. 3-7 ◽  
Author(s):  
Ruo Shan Lei ◽  
Ming Pu Wang ◽  
Guang Run Chen ◽  
Yin Yan Li
Keyword(s):  
Electrical Conductivity ◽  
Grain Size ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Microstructure And Properties ◽  
Vacuum Hot Pressing ◽  
Hot Pressing Sintering

This paper presents the synthesis of a Cu-0.5wt%Nb alloy via mechanical alloying (MA) and subsequent hot pressing. The evolutions of the density, microstructure, microhardness and electrical conductivity of the alloy as a function of the sintering temperatures were investigated. The results show that the microhardness of the alloy decreases with increasing consolidation temperatures, while the density and the conductivity improve. The alloy, subjected to vacuum hot-pressing sintering under 25 MPa pressure and 800 °C for 2h, has a microhardness of 102 HV and an electrical conductivity of 98% IACS. The as processed alloy is characterized by Nb nanoparticles distributed in the submicron sized Cu grains. The microhardness and electrical conductivity of the alloy are closely related with the microstructure, i.e. Cu grain size, as well as the presence and distribution of Nb nanoparticles.

Characterization and Properties of CuZrAlTiNiSi High Entropy Alloy Coating Obtained By Mechanical Alloying and Vacuum Hot-Pressing Sintering

JOM ◽  
2020 ◽  
Vol 72 (3) ◽  
pp. 1254-1263 ◽  
Author(s):  
Zihan Han ◽  
Dongzhi Wang ◽  
Xiaohan Chen ◽  
Guomang Shao ◽  
Xi Zhang ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Hot Pressing ◽  
Alloy Coating ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Vacuum Hot Pressing ◽  
Hot Pressing Sintering

AlCrFeNi High-Entropy Coating Fabricated by Mechanical Alloying and Hot Pressing Sintering

2017 ◽  
Vol 898 ◽  
pp. 628-637 ◽  
Author(s):  
Cai Yun Shang ◽  
Yan Wang
Keyword(s):  
Solid Solution ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Mechanical Alloying ◽  
Hot Pressing ◽  
Steel Substrate ◽  
Solid Solution Phase ◽  
High Entropy ◽  
Vacuum Hot Pressing ◽  
Hot Pressing Sintering

The AlCrFeNi high entropy coating was successfully prepared by mechanical alloying and vacuum hot pressing sintering technique on Q235 steel substrate, and the microstructures and microhardness, wear resistance and corrosion resistance were characterized in detail. Results showed that single body-centered cubic solid solution phase appears when the blended powder is ball milled for 30 h. The vacuum hot pressing sintered AlCrFeNi high entropy coating with single BCC solid solution is about 500 μm in thickness, which metallurgically bonded to substrate. The microhardness of the AlCrFeNi high entropy coating is about 520 HV, more than three times larger than that of the substrate. The wear resistance and corrosion resistance of the coating in 3.5% NaCl solution are greatly improved compared with the substrate, showing a dramatic reduction in average corrosion rate and wider passive range.

Thermoelectric Properties of Half-Heusler TiCoSb1-xSnx Synthesized by Mechanical Alloying Process

2013 ◽  
Vol 660 ◽  
pp. 61-65
Author(s):  
Il Ho Kim ◽  
Young Geun Lee ◽  
Moon Kwan Choi ◽  
Soon Chul Ur
Keyword(s):  
Electrical Conductivity ◽  
Mechanical Alloying ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Subsequent Annealing ◽  
Absolute Value ◽  
Vacuum Hot Pressing ◽  
Seebeck Coefficients ◽  
Sb Doping ◽  
The Absolute

Half-heusler TiCoSb1-xSnx (0.00≤x≤0.05) alloys were prepared by mechanical alloying of elemental powders, and consolidated by vacuum hot pressing. Sn doped half-Heusler phases of TiCoSb was successfully produced in all doping ranges by vacuum hot pressing using as-milled powders without subsequent annealing. However, a little fraction of CoSb phase appeared after hot pressing. Thermoelectric properties as functions of temperature were evaluated for hot pressed specimens. Seebeck coefficients showed to change in conductivity by doping and the absolute value revealed relatively low. It is shown that electrical conductivity is relatively high and thermal conductivities are compatibly low. Sb doping up to x=0.02 in TiCoSb1-xSnx was shown to be effective on thermoelectric properties in this study.

Spark Plasma Sintering and Hot Pressing Sintering of Nanocrystalline WC-10CO-0.8VC

2007 ◽  
Vol 534-536 ◽  
pp. 1229-1232
Author(s):  
Li Hui Zhu ◽  
Guang Jie Shao ◽  
Yi Xiong Liu ◽  
Dave Siddle
Keyword(s):  
Relative Density ◽  
Spark Plasma Sintering ◽  
Hot Pressing ◽  
Nanocrystalline Powders ◽  
Microstructure And Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Hot Pressing Sintering

WC-10Co-0.8VC nanocrystalline powders were sintered by spark plasma sintering (SPS) and hot pressing sintering (HPS), and the microstructure and properties were compared. Results show that, sintered at 1300°C, the sample prepared by SPS for only 3 minutes has higher density than that prepared by HPS for 60 minutes. SEM and SPM observation shows SPS at 1200°C has a more uniform and finer microstructure, and most of the WC grains are smaller than 100nm. It has a relative density of 95.1%, HV30 of 1887, and KIC of 11.5 MPam1/2. If a suitable sintering parameter is chosen, SPS is a promising consolidation technique to prepare nanocrystalline WC-10Co-0.8VC with improved properties.

Microstructure and properties of Cu-TiNi composites prepared by vacuum hot pressing

2021 ◽  
pp. 162729
Author(s):  
Xi Zhang ◽  
Zhu Xiao ◽  
Ziqi Xia ◽  
Shuo Han ◽  
Xiangpeng Meng ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Microstructure And Properties ◽  
Vacuum Hot Pressing
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