Ti-Cr-Mn三元系的相关系实验研究

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摘要通过对Ti-Cr-Mn平衡合金进行电子探针(EPMA)和X射线衍射(XRD)分析,构建Ti-Cr-Mn三元系在1 373、1 173和973 K的等温截面。结果表明,Cr在TiMn₂(Laves C14)中具有很大的固溶度(摩尔分数),在973 K约为 57.8%,在1 373 K时达到60.5%,由于晶体结构的差异,TiMn₂和TiCr₂,不能形成连续固溶体。TiMn_1-_x相在1373K稳定存在。Ti在高温σ-H相中的固溶度(摩尔分数)为6.7%,高于其在低温σ-L相中的固溶度。在973~1 373 K温度范围内,Ti-Cr-Mn体系中没有发现三元化合物。本研究测定的Ti-Cr-Mn三元系在973~1 373 K范围的相关系可对应用于该温度范围的Ti-Mn基储氢合金制备提供一定的理论指导。

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	李佳辉
	胡汀
	蔡格梅

关键词 ： Ti-Cr-Mn三元系, 平衡合金, 相平衡, TiMn₂合金

Abstract：Through electron probe (EPMA) and X-ray diffraction (XRD) analysis of the Ti-Cr-Mn equilibrium alloy, the isothermal cross-sections of the Ti-Cr-Mn ternary system at 1 373, 1 173 and 973 K were constructed. According to present results, TiMn₂ (Laves C14) has a large solid solubility for Cr, mole fraction about 58% at 973 K, even reaching 60.5% at 1 373 K. In addition, TiMn₂ and TiCr₂can not form a continuous solid solution due to their difference in crystal structure. The TiMn_1-_x phase exists stably at 1 373 K. The solid solubility of Ti in the high temperature σ-H phase is 6.7% (mole fraction), which is higher than its solubility in the low temperature σ-L phase. In the temperature range of 973- 1 373 K, there is no ternary compound found in this ternary system. The phase relationship of Ti-Cr-Mn ternary system in the range of 973-1 373 K determined in this study can provide certain theoretical guidance for the preparation of Ti-Mn-based hydrogen storage alloys in this temperature range.

Key words： Ti-Cr-Mn ternary system equilibrated alloys phase equilibria TiMn₂alloys

收稿日期: 2021-05-17 出版日期: 2021-11-10

ZTFLH:

TG113

基金资助:国家重点研发计划资助项目(2018YFE0306101,2016YFB0701301)

通讯作者: 蔡格梅,教授,博士。电话：15116205899;E-mail: caigemei@csu.edu.cn

引用本文:

李佳辉, 胡汀, 蔡格梅. Ti-Cr-Mn三元系的相关系实验研究[J]. 粉末冶金材料科学与工程, 2021, 26(5): 419-427.
LI Jiahui, HU Ting, CAI Gemei. Experimental investigation of phase relations in the Cu-Cr-Ti system. Materials Science and Engineering of Powder Metallurgy, 2021, 26(5): 419-427.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I5/419

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