摘要
通过力学性能试验、金相、扫描电镜及透射电镜等方法和手段对MB2 6 (Mg Zn Zr RE)合金在不同热加工工艺条件下的样品进行了分析和研究。研究结果表明 :MB2 6 镁合金在挤压、淬火及淬火时效 3种热加工工艺条件下 ,以挤压状态下所获得的力学性能为最佳 ,其σb 值可达3 70MPa以上。5 10℃ /2h的淬火工艺使挤压态下的力学性能大为下降。微观原因为 :加热破坏了挤压态下均匀的板条组织及合金元素的均匀分布 ,并产生严重的过烧组织。170℃ /10h时效工艺可使淬火态下微观范围内的淬火空位得到填补 ,但不能改善较为宏观的孔洞的存在及组织疏松的状况 ,并产生再结晶等轴晶粒及晶界 ,因而也不能明显地改善其力学性能。MB2 6 镁合金以挤压态为最佳使用状态。
The MB 26 (Mg-Zn-Zr-RE) alloy samples treated with different hot working processes were analytically studied by mechanical performance test, metallography, SEM and TEM etc. The results show that the extruded MB 26 samples have the best mechanical properties. The extruded samples′ σ b value is greater than 370 MPa. The 510 ℃/2 h quenching process makes the extruded samples′ mechanical properties drop greatly. The reasons are that the heating destroys the extruded samples′ lath structures and the homogeneity of the alloying elements′ distribution. Furthermore, some severe burnt structures are formed. At the micro-level the 170 ℃/10 h aging process makes the quenching vacancies be filled up, but the process can not fundamentally change the state of the existence of the quenching cavities and loose structures at the macroscopical level. In this time isometric grains are recrystallized and their grain boundaries are formed during the aging process. For the above mentioned the aging process can not observably improve the alloy′s mechanical properties. the MB 26 magnesium matrix alloy would be in its best use condition in the extruded state.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2004年第5期942-946,共5页
Chinese Journal of Rare Metals
关键词
镁合金
稀土
热加工工艺
magnesium matrix alloy
rare earth element
hot working process
