基于CALPHAD计算的铸造Al-Si-Cu-Mg合金热处理工艺优化研究

doi:10.11896/cldb.22050146

材料导报

2023, Vol. 37

Issue (22): 22050146-6 https://doi.org/10.11896/cldb.22050146

金属与金属基复合材料

基于CALPHAD计算的铸造Al-Si-Cu-Mg合金热处理工艺优化研究

张明山¹, 田亚强¹, 郑小平¹, 张源¹, 王俊升^2,3,*, 陈连生^1,*

1 华北理工大学教育部现代冶金技术重点实验室,河北唐山 063210
2 北京理工大学材料学院,北京 100081
3 北京理工大学前沿交叉科学研究院,北京 100081

Optimization of Heat Treatment Process of Al-Si-Cu-Mg Cast Alloy Based on CALPHAD Calculation

ZHANG Mingshan¹, TIAN Yaqiang¹, ZHENG Xiaoping¹, ZHANG Yuan¹, WANG Junsheng^2,3,*, CHEN Liansheng^1,*

1 Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan 063210, Hebei, China
2 School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
3 Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing 100081, China

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摘要热处理工艺参数的优化在铸造Al-Si-Cu-Mg合金组织性能调控方面扮演着重要角色。本工作以铸造Al-Si-Cu-Mg合金为研究对象,利用热力学计算和实验相结合的方法对合金的热处理工艺参数进行优化设计。热力学计算和差示扫描量热法(DSC)结果表明,Al-Si-Cu-Mg合金低熔点共晶相Al₂Cu相的形成温度是501 ℃,并且通过热力学软件动力学模块计算可知Si、Mg和Cu元素在495 ℃固溶温度下5 h内能够达到均匀化扩散。随着固溶温度的升高和时间的延长,共晶硅发生熔断、球化和粗化长大现象。另外,显微硬度受固溶程度以及共晶硅形貌的影响,在固溶过程中随着固溶温度的升高和时间的延长先升高后降低。当固溶温度为495 ℃、固溶时间为12 h时,显微硬度达到最大值(70.8±1.0)HV,球状共晶硅的Feret直径为2.8 μm。在170 ℃下对合金进行时效处理时,合金的显微硬度逐渐升高,当时效时间为5 h时达到峰时效,其显微硬度达到(119.0±5.7)HV。

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	张明山
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	陈连生

关键词: 铸造Al-Si-Cu-Mg合金热处理工艺热力学计算共晶硅显微硬度

Abstract: The optimization of heat treatment process parameters plays an important role in the regulation of microstructure and properties of Al-Si-Cu-Mg cast alloy. In this work, the heat treatment process parameters of Al-Si-Cu-Mg cast alloy were optimized by the combination of thermodynamic calculation and experiment. The results of thermodynamic calculation and differential scanning calorimetry (DSC) show that the formation temperature of low melting point eutectic Al₂Cu phase is 501 ℃, and the calculation of thermodynamic software dynamics module shows that Si, Mg and Cu elements reach homogenization diffusion within 5 h at 495 ℃. With the increase of solution temperature and time, eutectic Si gradually fragments, spheroidizes and coarsens. In addition, the microhardness is affected by the degree of solution heat treatment and the morphology of eutectic Si. During the solution heat treatment, the microhardness first increases and then decreases with the increase of solution temperature and time. When the solution temperature is 495 ℃ and the solution time is 12 h, the microhardness reaches the maximum value of (70.8±1.0)HV, and the Feret diameter of spherical eutectic Si is 2.8 μm. When the alloy is aged at 170 ℃, the microhardness of alloy increases gradually, and reaches the peak aging when the aging time is 5 h, and the microhardness reaches (119.0±5.7)HV.

Key words: Al-Si-Cu-Mg cast alloy heat treatment process thermodynamic calculation eutectic Si microhardness

出版日期: 2023-11-25 发布日期: 2023-11-21

ZTFLH:

TG146.2

基金资助: 河北省自然科学基金青年基金(E2022209059;E2020209153);唐山市科技计划项目(22130217G)

通讯作者: * 王俊升,北京理工大学前沿交叉科学研究院/材料学院教授、博士研究生导师。2002年7月、2005年7月和2009年1月分别于北京科技大学、北京科技大学和英国伦敦帝国理工学院获得学士、硕士和博士学位。长期从事集成计算材料工程研究,专注于航空轻质铝合金、镁合金设计、表征和应用的基础研究,在Additive Manufacturing、Corrosion Science、Materials Science and Engineering A、Scripta Materialia、Journal of Alloys and Compounds、Journal of Materials Science & Technology 等期刊发表学术论文50余篇。
陈连生,华北理工大学冶金与能源学院教授、博士研究生导师。1990年7月、1998年7月和2008年7月分别于河北理工学院、燕山大学和东北大学获得学士、硕士和博士学位。长期从事材料加工新技术与新工艺、高性能钢铁材料强韧化机理、金属基复合材料等方面的研究。在Materials Characterization、Journal of Alloys and Compounds、Acta Metallurgica Sinica (English Letters)、《金属学报》《材料导报》等期刊发表学术论文80余篇。junsheng.wang@bit.edu.cn;kyckfk@ncst.edu.cn

作者简介: 张明山,华北理工大学冶金与能源学院讲师。2013年7月、2017年4月和2021年9月分别于陕西理工学院、华北理工大学和北京理工大学获得学士、硕士和博士学位。目前主要从事新型高强铸造铝合金设计与组织性能调控方面的研究,在Mate-rials Science and Engineering A、Journal of Alloys and Compounds、Calphad、Materials Today Communications、Materials Science and Technology等期刊发表学术论文6篇。

引用本文:

张明山, 田亚强, 郑小平, 张源, 王俊升, 陈连生. 基于CALPHAD计算的铸造Al-Si-Cu-Mg合金热处理工艺优化研究[J]. 材料导报, 2023, 37(22): 22050146-6.
ZHANG Mingshan, TIAN Yaqiang, ZHENG Xiaoping, ZHANG Yuan, WANG Junsheng, CHEN Liansheng. Optimization of Heat Treatment Process of Al-Si-Cu-Mg Cast Alloy Based on CALPHAD Calculation. Materials Reports, 2023, 37(22): 22050146-6.

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http://www.mater-rep.com/CN/10.11896/cldb.22050146 或 http://www.mater-rep.com/CN/Y2023/V37/I22/22050146

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