Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第21卷    第6期    总第147期    2011年6月

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文章编号:1004-0609(2011)06-1265-07
Mo、V和Ag对粉末冶金Ti-5Al合金组织与力学性能的影响
肖代红,杨宝刚,申婷婷,袁铁锤,贺跃辉,王守仁

(中南大学 粉末冶金国家重点实验室,长沙 410083)

摘 要: 采用元素混合法制备粉末冶金Ti-Al-Mo-V-Ag合金,通过金相观察、扫描电镜及力学性能测试等方法研究Mo、V和Ag的添加及烧结温度对Ti-5Al合金的烧结行为、显微组织与力学性能影响,并对其作用机制进行探讨。结果表明:1 350 ℃烧结时,V与Mo的添加能改善烧结合金的压缩强度,单独添加Ag时,则降低基体合金的综合性能,但当Ag与Mo、V同时添加到基体合金中时,改变合金的显微组织,提高烧结合金的致密度与抗压缩强度,致密度能达到96%,抗压缩强度达到1 782 MPa。同时,烧结温度不同时,相同成分的粉末冶金Ti-5Al合金的显微组织与性能也表现出不同的特征。

 

关键词: 钛合金;微合金化;烧结温度;显微组织;力学性能

Effects of Mo, V and Ag additions on microstructure and
mechanical properties of powder metallurgy Ti-5Al alloy
XIAO Dai-hong, YANG Bao-gang, SHEN Ting-ting, YUAN Tie-chui, HE Yue-hui, WANG Shou-ren

State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:The powder metallurgy (P/M) Ti-Al-Mo-V-Ag alloys were processed by powder metallurgy using the blended elemental (BE) technique. The effects of Mo, V and Ag additions and sintering temperature on the microstructures and mechanical properties of the Ti-5Al alloys were investigated using optical microscope, scanning electron microscope and mechanical properties tests. The results show that adding Mo or V elements improves the compression strength of the based alloys after sintering at 1 350 ℃, and Ag element addition decreases the properties of Ti-5Al alloy. However, adding Ag element with Mo and V elements increases the density and compressive strength of P/M Ti-5Al alloy. The relative density and compressive strength of the Ti-5Al-4Mo-4V-5Ag alloy are 96% and 1 782 MPa, respectively. Moreover, the sintering temperature also affects the microstructures and properties of the PM Ti-5Al based alloys.

 

Key words: titanium alloys; microalloying; sintering temperature; microstructure; mechanical properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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