Rapid dendrite growth and corrosion mechanism of Ti-Al-Zr alloy by electromagnetic levitation processing

被引：0

作者：

Xiao R.-L. ^{[1
]}

Sun C.-H. ^{[1
]}

Liu K.-L. ^{[1
]}

Ruan Y. ^{[1
]}

机构：

[1] School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 12期

基金：

中国国家自然科学基金;

关键词：

corrosion mechanism; electromagnetic levitation; rapid crystal growth; titanium alloy;

D O I：

10.11817/j.ysxb.1004.0609.2023-44054

中图分类号：

学科分类号：

摘要：

Ti-Al based alloys are widely used as low pressure turbine blades, compressor blades and nozzles in aviation and aerospace industry owing to the low density, high strength, excellent oxidation resistance and anti-creep performance. However, the corrosion mechanism and corrosion resistance of the rapid solidified alloys are not clear. In this work, the rapid solidification of Ti-Al-Zr alloy was realized by means of electromagnetic levitation (EML). The achieved maximum undercooling of Ti-Al-Zr alloy was 277 K. There existed an exponential relationship between the α-Ti dendrite growth velocity and undercooling. The achieved maximum dendrite growth velocity was 15 m/s at the undercooling of 277 K. The further analysis on corrosion morphology for rapid solidified Ti-Al-Zr alloy illustrated that the interdendritic γ phase had a worst corrosion resistance. The corrosion was firstly occurred in interdendritic γ phase, then γ phase in γ+α2 lath area, and finally α2 phase. The increasing of content of Zr in interdendritic γ phase can enhance the protection of the passive film to interdendritic γ phase and hinder the pit of the interdendritic γ phase. Moreover, the decreasing of the quantity of interdendritic γ grains weakened micro-galvanic effect and reduced pitting sensitivity, consequently delayed the corrosion process. Therefore, the corrosion resistance of Ti-Al-Zr alloy can be controlled effectively by controlling of the solute trapping effect and the alloy's microstructure through rapid solidification. © 2023 Central South University of Technology. All rights reserved.

引用

页码：4059 / 4069

页数：10

共 30 条

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