Ti-Cr-Mn三元系的相关系实验研究  

Experimental investigation of phase relations in the Cu-Cr-Ti system

作　　者：李佳辉 胡汀 蔡格梅[1] LI Jiahui;HU Ting;CAI Gemei(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2021年第5期419-427,共9页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点研发计划资助项目(2018YFE0306101,2016YFB0701301)。

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973K的等温截面。结果表明,Cr在TiMn;(Laves C14)中具有很大的固溶度(摩尔分数),在973K约为57.8%,在1 373 K时达到60.5%,由于晶体结构的差异,TiMn;和TiCr;,不能形成连续固溶体。TiMn;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 373K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。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, TiMn;(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, TiMn;and TiCr;can not form a continuous solid solution due to their difference in crystal structure. The TiMn;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.

关 键 词：Ti-Cr-Mn三元系 平衡合金 相平衡 TiMn 合金 

分 类 号：TG113[金属学及工艺—物理冶金]