多道次闭式模锻对Mg2Si/AZ31复合材料微观组织和性能的影响  

Effect of multi-pass closed-die forging on microstructure and properties of Mg2Si/AZ31 composite

作　　者：郭炜[1] 谌昀[1] 邹晋[1] 徐萌利 GUO Wei;SHEN Yun;ZOU Jin;XU Meng-li(Institute of Applied Physics of Jiangxi Academy of Sciences,Nanchang 330096,China;Jiangxi Radio and Television University University,Nanchang 330046,China)

机构地区：[1]江西省科学院应用物理研究所,江西南昌330096 [2]江西广播电视大学,江西南昌330046

出　　处：《轻合金加工技术》2020年第11期36-40,共5页Light Alloy Fabrication Technology

基　　金：国家自然科学基金(51404151);江西省科学院科研项目(2018-YCXY-11,2018-YYB-08,2017-YZD2-20);江西省重点研发计划(2020213BEL53026);江西省科学院科研项目(2020YZD-2)。

摘　　要：采用常规铸造方法制备了Mg2Si/AZ31复合材料,然后在400℃进行5道次闭式模锻加工,研究复合材料的微观组织、拉伸力学性能和耐磨性能。结果表明:模锻过程中基体施加的剪切应力将树枝状和汉字状的Mg2Si相破碎成细小颗粒,随着模锻道次的增加,复合材料晶粒尺寸逐渐细化,Mg2Si颗粒分布更加均匀,同时强度、塑性和耐磨性显著提高,模锻5道次后,复合材料的抗拉强度、伸长率从铸态的98 N/mm2、3.3%分别提高到175 N/mm2、18.2%。Mg2Si/AZ31 composite was prepared by means of conventional casting,then it was processed by closed-die forging through 5 passes at 400℃.Microstructure,tensile mechanical properties and wear resistance of the composite were studied in the test.The results show that both dendritic and Chinese script type Mg2Si phases are broken up into smaller particles due to the shear stress imposed by the matrix during the die forging process.With the increasing number of die forging passes,a finer grain size and more uniform distribution of Mg2Si particles are obtained along with significant improvement in strength,ductility and wear resistance.Mg2Si/AZ31 composite exhibits a tensile strength of 175 N/mm2 and elongation of 18.2%after 5 passes as compared to 98 N/mm^2 and 3.3%in the as-cast state.

关 键 词：Mg2Si/AZ31复合材料 闭式模锻 剧烈塑性变形 微观组织 性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG319[金属学及工艺—金属材料]