Duplex nanocrystalline alloys: Entropic nanostructure stabilization and a case study on W–Cr
作者: Tongjai ChookajornMansoo ParkChristopher A. Schuh
作者单位: 1* Department of Materials Science and Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA ; and National Metal and Materials Technology Center (MTEC) , National Science and Technology Development Agency (NSTDA) , Pathum Thani 12120 , Thailand
2 Department of Materials Science and Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , USA
刊名: Journal of Materials Research, 2015, Vol.30 (2), pp.151-163
来源数据库: Cambridge University Press Journal
DOI: 10.1557/jmr.2014.385
原始语种摘要: Grain boundary (GB) segregation can markedly improve the stability of nanostructured alloys, where the fraction of GB sites is inherently large. Here, we explore the concept of entropically supported GB segregation in alloys with a tendency to phase-separate and its role in stabilizing nanostructures therein. These duplex nanocrystalline alloys are notably different, both in a structural and thermodynamic sense, from the previously studied “classical” nanocrystalline alloys, which are solid solutions with GB segregation of solute. Experiments are conducted on the W–Cr system, in which nanoduplex structures are expected. Upon heating ball-milled W–15 at.% Cr up to 950 °C, a nanoscale Cr-rich phase was found along the GBs. These precipitates mostly dissolved into the W-rich grains leaving...
全文获取路径: Cambridge U Press  (合作)
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影响因子:1.713 (2012)

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关键词翻译
关键词翻译
  • segregation 分凝
  • alloys 多组分胶
  • Cr 
  • grains 谷粒
  • milled 磨碎了的
  • previously 以前
  • Grain 谷物
  • conducted 有陪同的
  • expected 预期
  • thermodynamics 热力学