作　　者： ; ; ; ; ;

机构地区： 江苏大学材料科学与工程学院

出　　处： 《Transactions of Nonferrous Metals Society of China》 2011年第11期2365-2371,共7页

摘　　要： 研究固溶处理对Mg-SiO2体系原位合成制备的Mg2Si/AZ91D复合材料的组织和性能的影响。结果表明:AZ91D镁合金在加入SiO2(其中Si占合金质量的1.5%)后,出现了粗大的汉字状Mg2Si相,固溶处理改变了Mg2Si相的形貌与分布,并使β-Mg17Al12相溶入到基体中;随着固溶时间的增加,汉字状的Mg2Si相熔断、球化,在420℃保温16h时Mg2Si相最为细小、弥散;固溶处理后复合材料的抗拉强度增加了14.9%,伸长率增加了38.9%。固溶处理时在Mg2Si/Mg界面间的界面张力作用下,Mg2Si相不断熔断、聚集、扩散,最终获得球化的Mg2Si相。 The influence of solution treatment on the microstructure and properties of Mg2Si/AZ91D composites fabricated from Mg-SiO2 system via in-situ processing method was investigated.The results show that coarse Chinese script shape Mg2Si phases can be formed by adding SiO2 into AZ91D magnesium alloy with Si content up to 1.5% of the alloy melt.During solution treatment,the morphology and distribution of the coarse Chinese script shape Mg2Si phases are modified.Meanwhile,the β-Mg17Al12 phase is dissolved into the magnesium matrix.With increasing holding time,the coarse Mg2Si phases tend to dissolve,break and spheroidize.After solution treatment at 420 ℃ for 16 h,Mg2Si phases become the finest and relatively well-distributed phase.The tensile strength and elongation are increased by 14.9% and 38.9%,respectively.It is believed that the Mg2Si phases continuously dissolve and break,and finally the spheroidized Mg2Si particles are obtained due to the interface tension of Mg2Si/Mg interface.

关 键 词： 复合材料 固溶处理 颗粒球化 界面张力

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]