Experimental Investigation and Thermodynamic Description of Phase Equilibria in the Al-Cr-Mo Ternary System

IF 1.5 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Journal of Phase Equilibria and Diffusion Pub Date : 2023-12-19 DOI:10.1007/s11669-023-01076-6

Cuiping Wang, Xiaodong Chen, Xi Wu, Yixiong Huang, Yihui Guo, Shuiyuan Yang, Yong Lu, Xingjun Liu

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Abstract

The isothermal sections of the Al-Cr-Mo ternary system at 1200 and 1000 °C were experimentally determined based on microstructure and phase constituents from the equilibrated alloys employing electron probe microanalysis, scanning electron microscopy, and x-ray diffraction. A new ternary compound phase named η with AlTi₃-type crystal structure covering a composition range with ~ 75 at.% Al was detected in these two investigated isothermal sections in the present work. Based on the experimental results and the published data of the three binary sub-systems, a thermodynamic description for the Al-Cr-Mo system was carried out using the CALPHAD (CALculation of PHAse Diagrams) method. The newly detected ternary phase η was modeled by a two-sublattice model of (Al)₃(Al,Cr,Mo)₁. A set of reliable thermodynamic parameters of the Al-Cr-Mo system was obtained, which are in satisfactory agreement with the experimental data. Based on the obtained thermodynamic parameters, much information related to the stable vertical sections, isothermal sections, liquidus projection, and miscibility gap of the bcc phase were predicted in the present work. The present work can provide essential experimental and thermodynamic data for the establishment of the Ni-Al-Cr-Mo based alloy database.

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铝-铬-钼三元体系相平衡的实验研究和热力学描述

利用电子探针显微分析、扫描电子显微镜和 X 射线衍射技术，根据平衡合金的微观结构和相组成，实验确定了铝-铬-钼三元体系在 1200 和 1000 ℃ 时的等温截面。在这两个研究的等温截面中，发现了一种新的三元化合物相η，其晶体结构为 AlTi3 型，成分范围为 ~ 75% Al。根据实验结果和已公布的三个二元子系统的数据，采用 CALPHAD（CALculation of PHAse Diagrams）方法对 Al-Cr-Mo 系统进行了热力学描述。新发现的三元相 η 是通过 (Al)3(Al,Cr,Mo)1的二子晶格模型来模拟的。得到了一组可靠的铝-铬-钼体系热力学参数，这些参数与实验数据的一致性令人满意。根据所获得的热力学参数，本研究预测了与 bcc 相的稳定垂直段、等温段、液相投影和混溶间隙有关的许多信息。本研究可为建立基于 Ni-Al-Cr-Mo 的合金数据库提供重要的实验和热力学数据。

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来源期刊

Journal of Phase Equilibria and Diffusion 工程技术-材料科学：综合

CiteScore

2.50

自引率

7.10%

发文量

审稿时长

1 months

期刊介绍： The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts. The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use. Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.