Microstructure, mechanical properties and corrosion resistance of low-cost Ti-Al-Cr-Fe alloys processed via powder metallurgy

被引：9
作者：
Zhou, Xiangxing [1 ]
Fang, Haoyu [1 ]
Li, Ruidi [2 ]
Yuan, Tiechui [1 ]
机构：
[1] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China
[2] Jiangxi Tianqi Auto Parts Co LTD, Ping Xiang 337004, Peoples R China
来源：
MATERIALS CHEMISTRY AND PHYSICS | 2024年 / 317卷
基金：
中国国家自然科学基金;
关键词：
Powder metallurgy titanium alloys; Phase evolution; Mechanical properties; Corrosion behavior; TITANIUM-ALLOY; BETA; BEHAVIOR; IRON; NB;
D O I：
10.1016/j.matchemphys.2024.129197
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A variety of economical Ti-3Al-6Cr-xFe (x = 0, 1, 2 wt%) alloys were prepared utilizing typical powder metallurgy (cold pressing and sintering) to explore the impact of Fe concentration on the densification behavior, phase evolution, microstructure, mechanical properties and corrosion resistance. The inclusion of Fe increases the compressibility. The high diffusivity of the Fe element contributes to the densification but excessive Fe inclusion causes Kirkendall pores to develop. Therefore, Ti-3Al-6Cr-1Fe has the highest density. Every alloy is made up of intermetallic (TiCr2), alpha, and beta phases. The proportion of the beta phase rose with the addition of Fe. The optimal combination of mechanical characteristics was obtained by Ti-3Al-6Cr-1Fe (ultimate tensile strength of 1093 MPa and ductility of 3.1%), which is explained by the interaction of higher density and solid solution strengthening effects. Ti-3Al-6Cr-2Fe has the greatest corrosion resistance due to the relatively high density and maximum beta phase proportion.
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页数：9
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