摘要
采用扫描电镜观察、电子探针分析及拉伸性能测试等方法研究了Pb的添加对AZ91合金显微组织和力学性能的影响。结果表明,Pb能够细化AZ91镁合金中的α-Mg和β-Mg17Al12的晶粒,抑制二次β的析出,且Pb可改善β-Mg17Al12相形态和分布。Pb通过细晶强化增加了合金强度和硬度,使合金的断裂机制从脆性解理断裂转变为准解理断裂。
The microstructures and mechanical properties of AZ91magnesium alloy added by plumbum （Pb） were investigated by scanning electron microscopy （SEM）, electron probe microanalyzer （EPMA） and tensile tests. The results have indicated that Pb refines α-Mg and β-Mg17Al12 grains, suppresses the precipitation of secondary β phase. At the same time Pb can improve the morphology and distribution of β-MglTAl12. Pb effectively increases the tensile strength and hardness of AZ91 magnesium alloys due to the fine-grained strength. The fracture mechanism of alloy changes from brittle cleavage into quasicleavage failure.
出处
《有色金属加工》
CAS
2009年第5期4-6,共3页
Nonferrous Metals Processing
关键词
AZ91镁合金
PB
显微组织
力学性能
AZ91 magnesium alloy
plumbum
microstructure
mechanical properties
