A New Aging Treatment Way for Near α High Temperature Titanium Alloys

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	A New Aging Treatment Way for Near α High Temperature Titanium Alloys
其他题名	A New Aging Treatment Way for Near α High Temperature Titanium Alloys
	Jun Zhang 1; Na Peng 1; Qingjiang Wang 1; Xinan Wang 1
	2009
发表期刊	材料科学技术学报：英文版
ISSN	1005-0302
卷号	000 期号:004 页码:454-458
摘要	Two near α titanium alloys, Ti-5.6Al-4.8Sn-2.0Zr-1Mo-0.35Si （1#） and Ti-6.0AI-4.8Sn-2.0Zr-1Mo-0.35Si （2#）, were solution-treated in the upper α＋β phase fields, and the duplex mixture microstructures consisting of the less volume fraction primary α phase （αp） and the transformed β phase （βt） were obtained. The aging treatments were carried out at 700℃ for 1# alloy and 760℃ for 2# alloy under varied terms, respectively. It guaranteed α2 ordered phase to precipitate only in αp but not in βt for the two alloys. The slower precipitation and growth of the α2 ordered phase and silicide was observed in 1# alloy in comparison with 2# alloy. The mechanical properties including tensile strength and ductility, the creep and lasting properties at 600℃ were investigated. Prolonging aging time did not predominantly change the tensile strength and ductility for the two alloys. The 600℃/100 h thermal exposure caused a notable decrease of tensile ductility in 2# alloy though no distinct decrease could be observed in 1# alloy after the thermal exposure. The lasting property of i# alloy was increased with prolonging aging time and finally was equal to or even better than that of 2# alloy. Nevertheless, no evident increase emerged in 2# alloy with prolonging aging time. Similarly, the creep property of 1# alloy monotonously increased with increasing aging time and finally was equal to or even better than that of 2# alloy. No evident increase could be observed for 2# alloy. It can be deduced that the overgrowth of α2 ordered phase and silicide is unable to enhance hot strength properties but cause an unacceptable damage to tensile ductility. The optimum equilibrium of the comprehensive properties depending on the proper control of α2 ordered phase and silicide can be achieved by properly selecting aging temperature and time.
其他摘要	Two near α titanium alloys, Ti-5.6Al-4.8Sn-2.0Zr-1Mo-0.35Si （1#） and Ti-6.0AI-4.8Sn-2.0Zr-1Mo-0.35Si （2#）, were solution-treated in the upper α＋β phase fields, and the duplex mixture microstructures consisting of the less volume fraction primary α phase （αp） and the transformed β phase （βt） were obtained. The aging treatments were carried out at 700℃ for 1# alloy and 760℃ for 2# alloy under varied terms, respectively. It guaranteed α2 ordered phase to precipitate only in αp but not in βt for the two alloys. The slower precipitation and growth of the α2 ordered phase and silicide was observed in 1# alloy in comparison with 2# alloy. The mechanical properties including tensile strength and ductility, the creep and lasting properties at 600℃ were investigated. Prolonging aging time did not predominantly change the tensile strength and ductility for the two alloys. The 600℃/100 h thermal exposure caused a notable decrease of tensile ductility in 2# alloy though no distinct decrease could be observed in 1# alloy after the thermal exposure. The lasting property of i# alloy was increased with prolonging aging time and finally was equal to or even better than that of 2# alloy. Nevertheless, no evident increase emerged in 2# alloy with prolonging aging time. Similarly, the creep property of 1# alloy monotonously increased with increasing aging time and finally was equal to or even better than that of 2# alloy. No evident increase could be observed for 2# alloy. It can be deduced that the overgrowth of α2 ordered phase and silicide is unable to enhance hot strength properties but cause an unacceptable damage to tensile ductility. The optimum equilibrium of the comprehensive properties depending on the proper control of α2 ordered phase and silicide can be achieved by properly selecting aging temperature and time.
关键词	高温钛合金时效处理机械性质老化处理
收录类别	CSCD
语种	中文
CSCD记录号	CSCD:3652588
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/156339
专题	中国科学院金属研究所
作者单位	1.沈阳大学 2.中国科学院金属研究所
推荐引用方式 GB/T 7714	Jun Zhang,Na Peng,Qingjiang Wang,et al. A New Aging Treatment Way for Near α High Temperature Titanium Alloys[J]. 材料科学技术学报：英文版,2009,000(004):454-458.
APA	Jun Zhang,Na Peng,Qingjiang Wang,&Xinan Wang.(2009).A New Aging Treatment Way for Near α High Temperature Titanium Alloys.材料科学技术学报：英文版,000(004),454-458.
MLA	Jun Zhang,et al."A New Aging Treatment Way for Near α High Temperature Titanium Alloys".材料科学技术学报：英文版 000.004(2009):454-458.