Microstructure evolution and room temperature deformation of a unidirectionally solidified Nb-22Ti-16Si-3Ta-2Hf-7Cr-3Al-0.2Ho (at.%) alloy

被引：26

作者：

Cheng, G. M. ^{[1
]}

He, L. L. ^{[1
]}

机构：

[1] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China

来源：

INTERMETALLICS | 2011年 / 19卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Composites; Rapid solidification processing; Microstructure; (as-cast; Deformation-induced; recrystallization-induced); Fracture toughness; Yield stress; Electron microscopy; transmission; IN-SITU COMPOSITES; SILICIDE-BASED COMPOSITES; ORIENTATION RELATIONSHIP; INTERFACIAL STRUCTURE; FRACTURE-TOUGHNESS; ALPHA-NB5SI3; ADDITIONS; CERAMICS; STRENGTH;

D O I：

10.1016/j.intermet.2010.08.015

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：

Unidirectional solidification (DS) experiments were performed on a Nb-22Ti-16Si-3Ta-2Hf-7Cr-3Al-0.2Ho (at.%) alloy and the growth rates were selected as 6, 10 and 16 mm/h, respectively. The effect of solidification rates on the microstructure development and room temperature deformation was investigated. The DS alloys were mainly composed of Nb solid solution (Nbss) and Nb5Si3 phases. All the Nbss/Nb5Si3 eutectic colonies aligned well along the growth direction of the DS specimens. A small amount of hex-Nb5Si3 phase was identified as intergranular phase when observed from the transverse section of the DS specimens. There was an orientation relationship between Nbss and hex-Nb5Si3, which was determined as [111](Nb)//[22 (4) over bar3](h) and the two almost parallel planes of (1 (1) over bar0)(Nb)//(1 (1) over bar 00)(h) with an include angle about 2.2 degrees. The DS alloys showed improved room temperature compressive strength and fracture toughness as compared with the casting alloy. (C) 2010 Published by Elsevier Ltd.

引用

页码：196 / 201

页数：6

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