Competitive Precipitation Behavior between T1 and Σ Phases in an Commercial Al-Cu-Li Alloy

被引：1

作者：

Fan, Li ^{[1
]}

Han, Wenke ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

来源：

MATERIALS ENGINEERING FOR ADVANCED TECHNOLOGIES (ICMEAT 2013) | 2014年 / 510卷

关键词：

Competitive precipitation; Al-Cu-Li alloy; Hardness; T-1; phase; sigma phase; TRANSMISSION ELECTRON-MICROSCOPY; MG-AG ALLOY; AEROSPACE APPLICATIONS;

D O I：

10.4028/www.scientific.net/AMM.510.106

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The competitive precipitation behavior between T-1 and sigma phases in Al-Cu-Li alloy was studied by hardness test, XRD and TEM observation. The hardness test results show that the changing curves are related to the densities of vacancies and dislocations, and competitive precipitation between age hardening precipitates. T-1 phases give rise to the rapid age hardening. XRD results indicates that there exists an alternation increase in peak value of diffraction intensity ranged from 40 to 45 degrees of the aged alloy for various ageing time. About four precipitation sequences occur during ageing of Al-Cu-Li alloy, including delta',theta, T-1 and sigma sequences. Competitive kinetics between T-1 and sigma phases result in the phenomenon of different precipitation behavior.

引用

页码：106 / 109

页数：4

共 12 条

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