Precipitations of W/Cu metallic phases in ZrC in the reactive melt infiltrated ZrC/W composite

被引:8
作者
Wang, Dong [1 ,2 ]
Chen, Hongtao [3 ]
Wang, Yujin [2 ]
Wei, Boxin [2 ,3 ]
机构
[1] Anhui Univ Technol, Sch Mat Sci & Engn, Maanshan 243002, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Key Lab Adv Struct Funct Integrat Mat & Green Mfg, Harbin 150001, Peoples R China
[3] Harbin Univ Sci & Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
基金
中国国家自然科学基金;
关键词
ZrC; Precipitate; Reactive melt infiltration; TEM; First-principles calculation; DISPLACIVE COMPENSATION; MECHANICAL-PROPERTIES; ZIRCONIUM CARBIDE; BEHAVIOR; MICROSTRUCTURE; SOLUBILITY; STABILITY;
D O I
10.1016/j.jallcom.2020.155919
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
W and Cu rich precipitates have been found in ZrC ceramic grains in the reactive melt infiltrated ZrC/W composite prepared at 1300 degrees C. The microstructures of the precipitates have been identified using transmission electron microscopy and energy dispersive X-ray spectroscopy. The substantial mechanism of the precipitation was studied by calculating and analyzing the lattice parameters of ZrC (a(ZrC)). First-principles calculations were also used to evaluate the formation energies of carbon sub-stoichiometric ZrC (ZrCx) with substitutional W or Cu atoms. The precipitates in ZrC are identified as W, Cu, CuW3 and Cu5Zr phases. The increase in C/Zr ratio in reaction formed ZrC grains causes the loss of Wand Cu solutes in ZrCx, which gives rise to an increment in a(ZrC). The presence of C vacancies is energetically favorable to the solid dissolutions of Wand Cu atoms in ZrCx lattice. Thus, the initial formed ZrCx with a large number of C vacancies has an ability to dissolve W and Cu solutes. And the metallic precipitates in ZrC grains are attributed to the reducing solubility limits of W and Cu with the increasing C content in ZrCx. (C) 2020 Elsevier B.V. All rights reserved.
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页数:10
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