固溶时效处理和<strong>Ce</strong>含量对<strong>Mg-Ce-Al</strong>合金导热性能和力学性能的影响

doi:10.11901/1005.3093.2025.209

材料研究学报

2026, Vol. 40

Issue (3): 234-240 DOI: 10.11901/1005.3093.2025.209

研究论文

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固溶时效处理和Ce含量对Mg-Ce-Al合金导热性能和力学性能的影响

柳韵¹, 刘健²(

), 王武孝¹

^1.西安理工大学材料科学与工程学院西安 710048
^2.西安理工大学印刷包装与数字媒体学院西安 710054

Effect of Solid Solution and Aging-treatment on Thermal Conductivity and Mechanical Properties of Mg-Ce-Al Alloys

LIU Yun¹, LIU Jian²(

), WANG Wuxiao¹

^1.School of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
^2.Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an 710054, China

引用本文:

柳韵, 刘健, 王武孝. 固溶时效处理和Ce含量对Mg-Ce-Al合金导热性能和力学性能的影响[J]. 材料研究学报, 2026, 40(3): 234-240.
Yun LIU, Jian LIU, Wuxiao WANG. Effect of Solid Solution and Aging-treatment on Thermal Conductivity and Mechanical Properties of Mg-Ce-Al Alloys[J]. Chinese Journal of Materials Research, 2026, 40(3): 234-240.

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摘要:

制备一种铸造Mg-xCe-1Al (x = 0.4，0.7，1.0)合金并将其在580 ℃固溶处理12 h和在200 ℃时效处理24 h，使用X射线衍射仪(XRD)、能谱仪(EDS)和扫描电子显微镜(SEM)等手段表征其物相成分、金属间化合物的形貌和分布、用激光导热仪和电脑控制材料实验机测试其热导率和抗拉强度，研究了固溶时效处理和Ce含量对其导热性能和力学性能的影响。结果表明：这种合金的铸态热导率随着Ce含量的提高而提高，从106.00 W/(m·K)提高到120.65 W/(m·K)，而抗拉强度先升高后降低，Ce含量(质量分数)为0.7%时达到最大值180.67 MPa。时效处理使Ce含量为0.7%合金的热导率和抗拉强度均达到最大值(热导率为126.02 W/(m·K)，极限抗拉强度为192.52 MPa)。根据合金中Al-Ce金属间化合物的数量、尺寸和形貌以及Al溶质原子的含量，研究了热导率和抗拉强度提高的机理。

关键词 ：有色金属及其合金, 镁合金, 固溶时效处理, 热导率, 力学性能

Abstract：

To concurrently improve thermal conductivity (TC) and mechanical properties, cast Mg-xCe-1Al (x = 0.4, 0.7, 1.0) alloys were prepared, followed by solid solution treatment at 580 ^oC for 12 h (T4) and aging treatment at 200 ^oC for 24 h (T6). The phase constituents, mechanical properties and thermal conductivity of the alloys in different states were determined by using X-ray diffraction (XRD), scanning electron microscopy (SEM), computer-controlled material testing machine and laser thermal conductivity meter. The results show that with the increase of Ce content of the as cast alloys, the TC of the alloy increases from 106.00 W/(m·K) to 120.65 W/(m·K), while the ultimate tensile strength (UTS) firstly rises and then decreases, and reach the maximum value of 180.67 MPa at the Ce content of 0.7%. After T6 treatment, the alloy with the Ce content of 0.7% shows the maximum TC and UTS (TC = 126.02 W/(m·K), UTS = 192.52 MPa). The strengthening mechanisms of TC and UTS were discussed, in terms of the variations of the amount and size of Al-Ce intermetallic phase and the content of Al solute atoms.

Key words： nonferrous metals and alloys Mg alloy solution and aging treatment thermal conductivity mechanical properties

收稿日期: 2025-06-18

ZTFLH:

TG146.2+2

基金资助:国家自然科学基金(52275377)

通讯作者: 刘健，教授，liujian@xaut.edu.cn，研究方向为镁合金及其复合材料

Corresponding author: LIU Jian, Tel: 17319954109, E-mail:liujian@xaut.edu.cn

作者简介: 柳韵，男，2001年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2025.209 或 https://www.cjmr.org/CN/Y2026/V40/I3/234

图1 铸态Mg-xCe-1Al的显微照片和α-Mg晶粒尺寸的分布

图2 Mg-xCe-1Al合金的XRD谱

图3 铸态Mg-1Ce-1Al合金的EDS能谱

图4 铸态、固溶态和时效态Mg-xCe-1Al合金的SEM照片

图5 铸态、固溶态和时效态合金中的Al2Ce和Al3Ce的含量

图6 铸态和时效态Mg-xCe-1Al中Al2Ce和Al3Ce尺寸的分布

图7 铸态、固溶态和时效态Mg-xCe-1Al合金的热导率与Ce含量的关系

表1 Mg-xCe-1Al合金的力学性能和热导率

表2 镁合金中的第二相与基体之间界面的热阻[22]

图8 铸态、固溶态和时效态Mg-xCe-1Al合金的应力-应变曲线

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