The microstructure optimizing of the Nb-14Si-22Ti-4Cr-2Al-2Hf alloy processed by directional solidification

被引：27

作者：

Yuan, Sainan ^{[1
]}

Jia, Lina ^{[1
]}

Ma, Limin ^{[1
]}

Cui, Renjie ^{[1
]}

Su, Linfen ^{[1
]}

Zhang, Hu ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

MATERIALS LETTERS | 2012年 / 84卷

关键词：

Nb-Si alloy; Directional solidification; Heat treatment; Crystal growth; Microstructure;

D O I：

10.1016/j.matlet.2012.06.044

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, the microstructure evolution of an Nb-14Si-22Ti-4Cr-2Al-2Hf alloy processed by liquid-metal-cooled directional solidification (LMC) and heat treatment (HT) was investigated. The microstructure in the quasi-steady-state growth region of the LMC ingot consisted of primary (Nb,Ti)(ss) dendrites and eutectic (Nb,Ti)(ss)/(Nb,Ti)(5)Si-3. The unstable (Nb,Ti)(3)Si phase was eliminated and the eutectic with coupled (Nb,Ti)(ss) and (Nb,Ti)(5)Si-3 occurred. After heat treatment of selection, the fiber reinforcing mash structure was maintained: the (Nb,Ti)(ss) phase connected to be a continuous matrix and the fine discontinuous fibrous (Nb,Ti)(5)Si-3 was distributed uniformly and parallel to the growth direction on longitudinal section. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：124 / 127

页数：4

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