AZ91镁合金挤压组织和性能研究  

Microstructure and Properties of Squeezing Casting AZ91 Magnesium Alloy

作　　者：潘国如[1] 王顺成[1] 

机构地区：[1]华南理工大学机械工程学院

出　　处：《特种铸造及有色合金》2007年第10期778-780,共3页Special Casting & Nonferrous Alloys

摘　　要：对AZ91镁合金铸锭进行(410±5)℃×10 h的固溶处理后,在330℃以挤压比为25∶1进行了挤压,研究了其组织和性能。结果表明,挤压AZ91镁合金具有较细的晶粒组织,第二相Mg17Al12被破碎,其分布变得弥散,个别呈流线分布;挤压AZ91镁合金比铸造AZ91镁合金的力学性能有较大提高,其屈服强度为210 MPa,抗拉强度为355 MPa,伸长率为18%。第二相Mg17Al12对镁合金的性能具有重要影响。The microstructure and properties of AZ91 magnesium alloy treated by solid solution at (410±5) ℃ for 10 hours have been investigated by squeezing casting with squeezing ratio of 25∶1 at 330 ℃. The results reveal that the fine grain in the squeezed AZ91 magnesium alloy can be observed, in which the Mg17Al12 phase is dispersively distributed due to its broken state, and some look on stream-flow distribution. Meanwhile, the yield strength, tensile strength and elongation of squeezed casting AZ91 magnesium alloy are 210 MPa, 355 MPa and 18%, respectively, which are apparently superior to that of as-cast ones. The second phase Mg17Al12 has the important effects on the mechanical properties of the magnesium alloy.

关 键 词：AZ91镁合金 挤压 微观组织 性能 

分 类 号：TG379[金属学及工艺—金属压力加工]