Effects of the addition of lanthanum and ultrasonic stirring on the microstructure and mechanical properties of the in situ Mg2Si/Al composites
Effects of the addition of lanthanum and ultrasonic stirring on the microstructure and mechanical properties of the in situ Mg2Si/Al composites
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DOI：
10.1016/j.matdes.2015.10.159
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发表时间：
2016-01
影响因子：
8.4
通讯作者：
Guangzhu Bai;Zheng Liu;Jixing Lin;Zhaofu Yu;Y. Hu;C. Wen
中科院分区：
文献类型：
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作者：
Guangzhu Bai;Zheng Liu;Jixing Lin;Zhaofu Yu;Y. Hu;C. Wen
在本研究中，添加镧（La）并在凝固过程中以不同功率进行超声搅拌，制备了一种复合材料（umg2si /Al）。复合材料的拉伸强度和伸长率同时提高，这是由于La的加入和超声搅拌对复合材料显微组织的积极影响。采用x射线衍射分析、光学显微镜和扫描电镜对其微观结构进行表征。硬度和拉伸试验用于评价机械性能。结果表明：添加0.4 wt.% La的Mg2Si/Al复合材料在150 W的超声搅拌下，获得了硬度132 HB、抗拉强度201 MPa、伸长率5.28%的复合力学性能；未添加La和超声搅拌的复合材料硬度为76 HB，拉伸强度为84 MPa，伸长率为2.02%。本研究表明，添加少量La并结合150w超声搅拌是一种很有前途的方法，可以改变其结构并提高其situMg2Si/Al复合材料的力学性能，并可用于工业应用。
In this study, anin situMg2Si/Al composite was fabricated with the addition of lanthanum (La) combined with ultrasonic stirring at different powers during solidification. The composite exhibited simultaneously enhanced tensile strength and elongation because of the positive effects of La addition and ultrasonic stirring on microstructure. X-ray diffraction analysis, optical microscopy and scanning electron microscopy were used for the microstructural characterization. Hardness and tensile tests were used for the evaluation of the mechanical properties. The results indicated that the Mg2Si/Al composite with the addition of 0.4 wt.% La combined with ultrasonic stirring at a power of 150 W exhibited a unique combination of mechanical properties including a hardness of 132 HB, a tensile strength of 201 MPa, and an elongation of 5.28%; while the composite without La addition nor ultrasonic stirring exhibited a hardness 76 HB, a tensile strength 84 MPa and an elongation 2.02%. This study demonstrated that a minor La addition combined with 150 W ultrasonic stirring is a promising approach in modifying the microstructure and enhancing the mechanical properties of thein situMg2Si/Al composite for industrial applications.