固相合成制备短碳纤维增强镁基复合材料的结构与性能  

Microstructures and Properties of SCFs/AZ31 Composite Fabricated by Solid State Synthesis

作　　者：杨钊[1] 许红雨[1] 胡茂良[1] 吉泽升 YANG Zhao;XU Hong-yu;HU Mao-liang;JI Ze-sheng(School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)

机构地区：[1]哈尔滨理工大学材料与科学工程学院

出　　处：《哈尔滨理工大学学报》2019年第5期13-18,共6页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51704087,51574100);黑龙江省普通本科高等学校青年创新人才培养计划(UNPYSCT-2016033)

摘　　要：采用固相合成技术制备短碳纤维(质量分数为3%)增强镁基复合材料。研究了不同挤压温度对复合材料组织及力学性能的影响规律。结果表明:适当升高挤压温度有利于形成组织均匀、晶粒细小的短碳纤维增强镁基复合材料;随着挤压温度的升高,复合材料显微组织均匀性先增后降,其力学性能呈现先提高后降低的趋势。400℃热挤出的复合材料性能最佳,抗拉强度和失效应变分别达到305MPa和6.1%。但是当挤压温度过高时,会因短碳纤维团聚、镁合金基体组织长大导致复合材料力学性能下降。Short carbon fibers reinforced AZ31 composites were fabricated by mechanical mixing and hot-extrusion,with 3%mass fraction of short carbon fiber.The effect of extrusion temperature on microstructure and mechanical properties of composites was studied.The results show that appropriate elevated extrusion temperature is beneficial to the uniform composition distribution and fine grain microstructure of the short carbon fibers reinforced AZ31 composites.With the increase of extrusion temperature,the homogeneity of the microstructure increases initially and then decrease,the mechanical properties of composite show the tendency of increasing firstly and then decreasing rapidly.When the extrusion temperature is 400℃,the composite exhibits optimal mechanical properties with tensile strength of 305MPa,and failure strain of 6.1%.However,too high of extrusion temperature causes carbon fibers agglomeration and magnesium matrix grain size growing,resulting in the properties reduction of the composite.

关 键 词：固相合成 短碳纤维 镁基复合材料 晶粒细化 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]