北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (12): 2547-2553.doi: 10.13700/j.bh.1001-5965.2016.0900

• 论文 • 上一篇    下一篇

热挤压对YAl2p/Mg-14Li-3Al复合材料组织和性能的影响

邱相儒1, 吴国清1, 潘英才1, 王刚刚2, 葛大梁3   

  1. 1. 北京航空航天大学 材料科学与工程学院, 北京 100083;
    2. 临沂高新区双航材料科技有限公司, 临沂 276000;
    3. 江苏立美航材科技有限公司, 无锡 214161
  • 收稿日期:2016-11-29 修回日期:2017-02-24 出版日期:2017-12-20 发布日期:2017-05-10
  • 通讯作者: 吴国清 E-mail:guoqingwu@buaa.edu.cn
  • 作者简介:邱相儒,男,硕士研究生。主要研究方向:镁锂基复合材料挤压成型;吴国清,男,博士,副教授。主要研究方向:轻质合金及复合材料设计与成型技术。
  • 基金资助:
    国家自然科学基金(50901005);航空科学基金(2010ZF51068)

Effect of hot extrusion on structure and properties of YAl2p/Mg-14Li-3Al composites

QIU Xiangru1, WU Guoqing1, PAN Yingcai1, WANG Ganggang2, GE Daliang3   

  1. 1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. Linyi High-Tech Development Zone Shuanghang Mat. Sci. & Tech. Co., Ltd., Linyi 276000, China;
    3. Jiangsu Limei Aero-material Technology Co., Ltd., Wuxi 214161, China
  • Received:2016-11-29 Revised:2017-02-24 Online:2017-12-20 Published:2017-05-10
  • Supported by:
    National Natural Science Foundation of China (50901005); Aeronautical Science Foundation of China (2010ZF51068)

摘要: 利用搅拌铸造法制备出不同体积分数的YAl2p/Mg-14Li-3Al复合材料,然后将其挤压成薄壁管材,通过金相显微镜、扫描电镜和万能试验机等手段研究了热挤压变形对复合材料显微组织及力学性能的影响。结果表明,通过热挤压变形,YAl2p增强体的分散性得到改善,复合材料的显微组织明显细化,力学性能显著提升。其中挤压态体积分数为1%的YAl2p/Mg-14Li-3Al复合材料与铸态相比,抗拉强度和屈服强度均提高了60%以上,塑性得到改善。在挤压的过程中,复合材料的挤压力峰值与Mg-14Li-3Al合金相比略有增加,且挤压力峰值达到的时间存在滞后的现象。

关键词: 热挤压, Mg-Li-Al基复合材料, YAl2p, 显微组织, 力学性能

Abstract: YAl2p/Mg-14Li-3Al composites with different volume fraction were fabricated by stir casting, and then the as-cast ingots were extruded as composite thin-walled tubes with the defined experimental parameters. Effects of hot extrusion deformation on microstructure and mechanical properties of YAl2p/Mg-14Li-3Al composites were investigated by optical microscope, scanning electronic microscope, tensile tests and so on. The results show that hot extrusion deformation can effectively improve the YAl2p distribution and the mechanical properties of the composites. In addition, the grains of matrix are significantly refined after hot extrusion. For as-extruded YAl2p/Mg-14Li-3Al composites with volume fraction of 1%, compared with as-cast condition, the tensile strength and the yield strength are both improved by over 60%, and the ductility is improved. In the process of hot extrusion, the extrusion pressure peak of the composite is improved slightly compared with Mg-14Li-3Al alloy, and the time of the peak pressure of the composite lags behind the alloy.

Key words: hot extrusion, Mg-Li-Al matrix composites, YAl2p, microstructure, mechanical property

中图分类号: 


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