Experimental Investigation of the Phase Equilibria in the Al-Mn-Zn System at 400°C

Tian-xu Wang, D. Kevorkov, Ahmad Mostafa, M. Medraj
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引用次数: 6

Abstract

Al-Mn-Zn ternary system is experimentally investigated at 400°C using diffusion couples and key alloys. Phase relationships and homogeneity ranges are determined for binary and ternary compounds using EPMA, SEM/EDS, and XRD. Reported ternary compound T3 (Al11Mn3Zn2) is confirmed in this study and is denoted as τ2 in this paper. Two new ternary compounds (τ1 and τ3) are observed in this system at 400°C. τ1 is determined as a stoichiometric compound with the composition of Al31Mn8Zn11. τ3 has been found to have homogeneity range of AlxMnyZnz ( at%; at%; at%). The binary compounds Al4Mn and Al11Mn4 exhibit limited solid solubility of around 6 at% and 4 at% Zn, respectively. Terminal solid solution Al8Mn5 is found to have maximum ternary solubility of about 10 at% Zn. In addition, ternary solubility of Al-rich β-Mn′ at 400°C is determined as 4 at% Zn. Zn-rich β-Mn′′ has a ternary solubility of 3 at% Al. The solubility of Al in Mn5Zn21 is measured as 5 at%. Based on the current experimental results, the isothermal section of Al-Mn-Zn ternary system at 400°C has been constructed.
Al-Mn-Zn体系400℃相平衡的实验研究
采用扩散偶和关键合金在400℃下对Al-Mn-Zn三元体系进行了实验研究。采用EPMA、SEM/EDS和XRD测定了二元和三元化合物的相关系和均匀性范围。报道的三元化合物T3 (Al11Mn3Zn2)在本研究中得到证实,文中记为τ2。在400℃时,在该体系中观察到两个新的三元化合物τ1和τ3。τ1是由Al31Mn8Zn11组成的化学计量化合物。发现τ3的均匀性范围为AlxMnyZnz (at%;在%;%)。二元化合物Al4Mn和Al11Mn4表现出有限的固体溶解度,分别约为6 at%和4 at% Zn。最终固溶体Al8Mn5在% Zn下的最大三元溶解度约为10。此外,富al β-Mn′在400℃时的三元溶解度在% Zn时为4。富锌β-Mn”的三元溶解度为3 at% Al,而Al在Mn5Zn21中的溶解度为5 at%。在现有实验结果的基础上,建立了Al-Mn-Zn三元体系在400℃时的等温截面。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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