The role of Kirkendall porosity in determining β → δ transformation types in Nb-Ti-Al alloys

被引：8

作者：

Shi, Zhiwu ^{[1
,2
]}

Wei, Hua ^{[1
,3
]}

Zhang, Hongyu ^{[1
]}

Jin, Tao ^{[1
]}

Sun, Xiaofeng ^{[1
]}

Zheng, Qi ^{[1
]}

机构：

[1] Chinese Acad Sci, Superalloys Div, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China

[2] AVIC Commercial Aircraft Engine Co Ltd, Shanghai 200241, Peoples R China

[3] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 211800, Jiangsu, Peoples R China

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2016年 / 60卷

基金：

中国国家自然科学基金;

关键词：

Nb-Ti-Al alloy; Phase transformation; Diffusion; Microstructure; Kirkendall porosity; PHASE-EQUILIBRIA; SYSTEM; GROWTH; MICROSTRUCTURES; COMPOSITE; FRACTURE; NB3AL; VOIDS;

D O I：

10.1016/j.ijrmhm.2016.07.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The formation of Kirkendall porosity and its role in determining beta -> delta transformation types in Nb-Ti-Al alloys has been reported. The Kirkendall porosity appears in Nb-Ti-Al alloys due to the discrepancy in diffusion rates of Nb, Ti and Al atoms. It is proposed that Kirkendall porosity can serve as a criterion in judging the types of beta -> delta phase transformations: The appearance of Kirkendall porosity indicates the long-range diffusional transformation and excludes the massive transformation. Moreover, the criterion is also applicable in some other alloy systems in judging the phase transformation types. Besides, Kirkendall porosity in Nb-Ti-Al alloys with different hot pressing durations exhibits different dimensions. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：108 / 112

页数：5

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