烧结温度对粉末冶金Ti600合金组织与力学性能的影响

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摘要采用混合元素粉末法,通过冷等静压成形和真空烧结,制备Ti600合金(名义成分为Ti-6Al-2.8Sn-4Zr- 0.5Mo-0.4Si-0.1Y),研究烧结温度对合金显微组织以及密度与力学性能的影响。结果表明,烧结温度为1 100 ℃时,合金组织为杂乱无章的α层片组织,而在1 200 ℃下烧结时α层片组织开始规则排列,形成α丛束,当烧结温度达到1 300 ℃时,α层片组织基本都形成α丛束。在合金组织中Zr元素和Mo元素固溶于β-Ti相,Al元素固溶于α-Ti相,Si元素富集于析出物,Sn、Y元素分布均匀。随烧结温度升高,合金中孔隙和α-Ti相数量逐渐减少,β-Ti相数量逐渐增加,合金的致密度提高,力学性能明显提升,1 300 ℃温度下烧结的合金致密度为92.8%,硬度(HV)为324.0,抗拉强度和伸长率分别为622.6 MPa和5.0%。

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	丁超
	邹黎明
	刘辛
	杭争翔
	吴伟
	李润霞

关键词 ：粉末冶金, Ti600合金, 显微组织, 力学性能, 元素分布

Abstract：Ti600 alloy (with a nominal composition of Ti-6Al-2.8Sn-4Zr-0.5Mo-0.4Si-0.1Y) was prepared by cold isostatic pressing and vacuum sintering using the mixed element powder method. The effects of sintering temperature on the microstructure, density and mechanical properties of the alloy were investigated. The results show that the microstructure of Ti600 alloy is composed of disordered α lamellar at the sintering temperature of 1 100 ℃, the α lamellar begins to arrange regularly to α colonies at the sintering temperature of 1 200 ℃, the α lamellar basically forms to α colonies at the sintering temperature of 1 300 ℃. The Zr and Mo elements dissolve in the β-Ti phase, the Al element dissolves in the α-Ti phase, and the Si element enriches in the precipitates, the Sn and Y elements distribute uniformly. With increasing the sintering temperature, the numbers of pores and α-Ti phase in the alloy gradually decrease, the amount of β-Ti phase gradually increases, and the density and the mechanical properties of the alloy increase. The alloy sintered at 1 300 ℃ has the relative density of 92.8%, the hardness (HV) of 324.0, the tensile strength of 622.6 MPa and elongation of 5.0%.

Key words： powder metallurgy Ti600 alloy microstructure mechanical property element distribution

收稿日期: 2018-04-02 出版日期: 2019-07-12

ZTFLH:

TF124

基金资助:辽宁省教育厅项目(201624083); 国家自然科学基金资助项目(51504072); 广州市对外科技合作专项(2014J4500024); 广东省国际合作专项(2014B050503003); 广东省公益研究与能力建设专项(2017A070702019)

通讯作者: 李润霞,教授,博士。电话：13624002022;E-mail: runxiali@163.com

引用本文:

丁超, 邹黎明, 刘辛, 杭争翔, 吴伟, 李润霞. 烧结温度对粉末冶金Ti600合金组织与力学性能的影响[J]. 粉末冶金材料科学与工程, 2019, 24(1): 8-14.
DING Chao, ZOU Liming, LIU Xin, HANG Zhengxiang, WU Wei, LI Runxia. Effects of sintering temperature on microstructure and mechanical properties of Ti600 alloy fabricated by powder metallurgy. Materials Science and Engineering of Powder Metallurgy, 2019, 24(1): 8-14.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2019/V24/I1/8

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