Fabrication of W-Cu alloy via combustion synthesis infiltration under an ultra-gravity field

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• 作者：Yuepeng Song (1) (2)
  Qian Li (1) (3)
  Jiangtao Li (4)
  Gang He (4)
  Yixiang Chen (4)
  Hyoung Seop Kim (2)
  
• 关键词：tungsten copper alloy ; combustion synthesis infiltration technique ; microstructure ; simulation
• 刊名：Metals and Materials International
• 出版年：2014
• 出版时间：November 2014
• 年：2014
• 卷：20
• 期：6
• 页码：1145-1150
• 全文大小：635 KB
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• 作者单位：Yuepeng Song (1) (2)
  Qian Li (1) (3)
  Jiangtao Li (4)
  Gang He (4)
  Yixiang Chen (4)
  Hyoung Seop Kim (2)
  
  1. Mechanical and Electronic Engineering College, Shandong Provincial Key Laboratory of Horticultural Machineries and Equipments, Shandong Agricultural University, Tai鈥檃n, 271018, China
  2. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea
  3. Shandong Transport Vocational College Taishan, Shandong, Tai鈥檃n, 271018, China
  4. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
  
• ISSN：2005-4149

文摘

Tungsten copper alloy with a tungsten concentrate of 70 vol% was prepared by self-propagating high-temperature synthesis in an ultra-gravity field. The phase structures and components of the W-Cu alloy fabricated via this approach were the same as those via traditional sintering methods. The temperature and stress distributions during this process were simulated using a new scheme of the finite element method. The results indicated that nonequilibrium crystallization conditions can be created for combustion synthesis infiltration in an ultra-gravity field by the rapid infiltration of the liquid copper product into the tungsten compact at high temperature and low viscosity. The cooling rate can be above 100,000 K/s and high stresses in tungsten (~5 GPa) and copper (~2.6 GPa) were developed, which passivates the tungsten particle surface, resulting in easy sintering and densifying the W-Cu alloy. The reliability of the simulation was verified through temperature measurement and investigation of the microstructure. The W-Cu composite-formation mechanism was also analyzed and discussed with the simulation results.