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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 7    July 2018

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Derivation and application of concentration formula of alloy genes of DO3-type in BCC alloy systems
PENG Hong-jian(彭红建)1, 2, LI Ling(李玲)1, LI Xiao-bo(李小波)2, XIE You-qing(谢佑卿)2

1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Central South University, Changsha 410083, China

Abstract:Taking Ta–W alloy system as an example, the concentration formulae of alloy genes of DO3-type alloys in BCC structures were derived on the basis of the theory of alloy genes and the number of coordination atoms. The concentrations of alloy genes of DO3-TaW3 and DO3-Ta3W ordered alloys were calculated as functions of composition xW and ordering degree (s). When s=smax, the concentrations of alloy genes of stoichiometric DO3-TaW3 compound are equal to those of alloys, that is, The concentrations of alloy genes of stoichiometric DO3-Ta3W compound are also equal to those of alloys, that is, As ordering degree decreases, alloy genes of DO3-TaW3 and DO3-Ta3W ordered alloys will split. And the degree of splitting of alloy genes increases with the ordering degree decreasing. The atomic states and properties of DO3-TaW3 and DO3-Ta3W ordered alloys were calculated as a function of composition xW. The reason was pointed out that preparation of DO3-TaW3 and DO3-Ta3W intermetallic compounds is difficult due to small differences in their cohesive energies. It will provide theoretical guidance for the scientific designation to new candidate for ultra- high-temperature materials in areo-engine applications.

 

Key words: Ta–W alloy system; BCC structure; alloy gene

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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