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Variation of the mechanical properties of tungsten heavy alloys tested at different temperatures

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Rare Metals 2011年第4期30卷 392-395页

作者： S.H.Islam Research Center College of EngineeringKing Saud University

The high-temperature mechanical properties of 95W-3.5Ni-1.5Fe and 95W-4.5Ni-0.5Co alloys were investigated in the temperature range of room temperature to1100℃. The yield strength and tensile strengths declined gradually, and the ductility of both alloys increased as the testing temperature was increased to 300℃. All the three properties reached a plateau at temperatures between 300 and 500℃ in the case of 95W-3.5Ni-l.5Fe and at temperatures between 350 and 700℃ in the case of 95W-4.5Ni-0.5Co. Thereafter, the ductility as well as yield and tensile strengths decreased considerably.

关键词： liquid phase sintering tungsten alloys tensile testing mechanical properties

Densification of W-Ni-Cu and W-Fe-Cu alloys at 1573 K

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Journal of Materials Science & Technology 1999年第1期15卷 94-96页

作者： Xiong, Huaping Zhang, Lianmeng Shen, Qiang Yuan, Runzhang Wuhan Univ Technol State Key Lab Mat Synth & Proc Wuhan 430070 Peoples R China

The tungsten alloys with Ni-Cu and Fe-Cu additives were sintered at 1573 K for 1 h by hot-pressing method. It was found that the alloy relative density can be improved with the addition of Cu when Cu content is not very high, and W95Ni3Cu2 alloy with full density can be obtained Under the sintering condition. However, with the Cu content further increasing, the relative density change of W-Ni-Cu alloy and W-Fe-Cu alloy shows different trends, the former tends to decrease obviously, but the latter shows little change. According to the analysis results, the element Cu has different effects on the activation capability of Ni and Fe during sintering of the tungsten alloys. (Edited author abstract) 7 Refs.

关键词： tungsten alloys

Effects of Cobalt on the Sintering Behavior of Mechanically Activated tungsten Powder

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Rare Metals 2001年第3期20卷 183-186页

作者： Chengchang Jia, Xiaoyang Liu, Xiuhu Guan, Xuekuan Su, Jun Zhao, Zizhang Xie 1) Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China 2) Beijing Research Institute of Powder Metallutrgy, Beijing 10005 北京科技大学北京 100083 北京科技大学北京 100083. 北京市粉末冶金所北京 100053 北京理工大学北京 100022.

tungsten alloys were prepared with mechanically activated powder added microelement cobalt in order to improve the process and properties of alloys. Properties of alloys such as density, hardness and bending strength were measured. The results show that through mechanical activation, cobalt can accelerate the sintering process of these alloys By the combination of mechanical activation and adding microelement cobalt, tungsten alloys with higher density and better properties can be obtained.

关键词： powder metallurgy tungsten alloys cobalt mechanical activation sintering behavior

SYNTHESIS AND SOLID STATE SINTERING OF W-Ni-Fe NANO-COMPOSITE POWDERS

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Acta Metallurgica Sinica(English Letters) 2000年第3期13卷 917-920页

作者： Qu, X.H. Fan, J.L. Li, Y.M. Huang, B.Y. Central South Univ of Technology Changsha China

The mixture of 90 wt%W, 7 wt%Ni and 3 wt%Fe elemental powders was milled in a planetary high-energy ball mill. The evolution of the structure during milling and the sintering behavior of the milled powders were tested. The results showed that by mechanical alloying W(Ni, Fe) supersaturated solid solution with nano-meter size formed, which can enhance the sintering process. Fully dense alloy from the milled powders was obtained through solid state sintering. The tensile strength of the obtained alloy is over 900 MPa which is comparable to that of the alloy sintered by traditional liquid-phase sintering from un-milled powders of the same composition.

关键词： tungsten alloys Nickel alloys Iron alloys Mechanical alloying Powder metals Sintering Morphology Tensile strength