Al-X(X=Sc,Zr,Er)合金热处理过程中的弹性场演化——三维多相场研究的启示

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
S. Dhanish, Sundar Daniel
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引用次数: 0

摘要

本文采用三维多相场方法研究了Al3X(X=Sc,Zr,Er)在Al基体中沉淀过程中的微观结构演变及其产生的应力、应变和浓度场分布。根据热处理、模量失配、晶格参数失配和界面自由能的不同,沉淀物发展为菱形亚八面体和近立方体形态。成分分布和AlAl3X转变驱动力图确定了每种合金沉淀动力学的差异。利用相变过程中能量成分的时间演化图,详细分析了这三个系统的降水机制。Al3Er沉淀物由于Er's的高扩散率和显著的晶格参数失配。该系统对颗粒生长具有高的化学和弹性驱动力,从而在相对较低的温度和时间下实现准静态平衡。因此,该系统观察到Al基体周围的高强度应力、应变和应变能场。从本研究中获得的理论模拟结果将有助于铝多组分合金在高强度应用中的设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Elastic Field Evolution in Al-X (X=Sc,Zr,Er) Alloy During Heat Treatment, Insights from 3D- Multi Phase Field Study
Microstructural evolution and resulting stress, strain, and concentration field distribution during Al3X (X=Sc, Zr, Er) precipitation in Al matrix are investigated in this work using the 3D-multi phase-field method. Depending on the heat treatment, modulus mismatch, lattice parameter mismatch, and interfacial free energy, precipitate developed to rhombicuboctahedron, and near cuboidal morphologies. The composition distribution and AlAl3X transformation driving force map identified a difference in precipitation kinetics for each alloy. The precipitation mechanism in the three systems is analysed in detail with temporal evolution plots of energy components during phase transformation. Al3Er precipitate exhibits the highest growth rate due to Er's high diffusivity and significant lattice parameter mismatch in the Al-Er system. The system has a high chemical and elastic driving force for particle growth, thus attaining quasi-static equilibrium at a relatively lower temperature and time. Therefore, this system observes high magnitude stress, strain, and strain energy field around the Al matrix. The theoretical simulation results obtained from the present study will benefit Aluminium multicomponent alloy design for high strength applications.
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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