机械设备外壳用锻态Mg-5.5Al-3.5Sn高强镁合金的组织与性能  

Microstructure and properties on forged Mg-5.5Al-3.5Sn high-strength magnesium alloy for mechanical equipment shell

作　　者：蔡晓娜[1] Cai Xiaona(Department of Electro-machinery Engineering,Guangdong University of Science and Technology,Dongguan 523083,China)

机构地区：[1]广东科技学院机电工程系,广东东莞523083

出　　处：《锻压技术》2021年第6期220-224,共5页Forging & Stamping Technology

基　　金：广东省自然科学基金资助项目(2018CVB237)。

摘　　要：以拔长的方式进行了机械设备外壳用Mg-5.5Al-3.5Sn高强镁合金的等温锻造,并与锻造前试样进行了显微组织和力学性能的对比分析。结果表明:与锻造前试样相比,锻态合金的抗拉强度增大了119 MPa、屈服强度增大了122 MPa、断后伸长率增大了7.2%;合金内部晶粒明显细化,合金中Mg17Al12相由骨头状无规律的分布变为细小致密的网状结构分布,Mg2Sn相则由较为粗大的颗粒状无规律分布变为细小颗粒状弥散分布。Mg-5.5Al-3.5Sn高强镁合金的抗拉强度为326 MPa、屈服强度为234 MPa、断后伸长率为15.1%,具有较好的商业应用价值。Mg-5.5 Al-3.5 Sn high-strength magnesium alloy for mechanical equipment shell was isothermal forged by drawing out, and the microstructure and mechanical properties were compared and analyzed with the specimens before forging. The results show that compared with the samples before forging, the tensile strength, the yield strength and the elongation of the forged alloy increases by 119 MPa, 122 MPa and 7.2%, respectively, and the grains in the alloy are obviously refined. Furthermore, Mg17 Al12 phase in the alloy changes from a bone-like and irregular distribution to a fine and dense network structure, and Mg2 Sn phase changes from a relatively coarse granular and irregular distribution to a fine granular and dispersed distribution. Thus, Mg-5.5 Al-3.5 Sn high-strength magnesium alloy with the tensile strength of 326 MPa, the yield strength of 234 MPa and the elongation 15.1% has good commercial application value.

关 键 词：锻造 拔长 Mg-5.5Al-3.5Sn高强镁合金 显微组织 力学性能 

分 类 号：TG376.9[金属学及工艺—金属压力加工]