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利用Formastor F膨胀仪测定过冷 β相等温分解曲线 ,借助KYKY 80 0扫描电镜观察铸态与等温分解组织 ,研究不同热处理工艺对Zn 2 7Al 2 7Cu 0 0 3Mg 0 5Mn合金显微组织和机械性能的影响。结果表明 ,合金元素的加入使过冷 β相稳定性增加 ,TTT曲线右移。采用适当的热处理工艺可使合金强韧化 ,拉伸断口由脆性的沿晶断裂变为韧窝状断裂。
The Formastor F dilatometer was used to measure the isothermal cooling curve of β phase, and the as-cast and isothermal decomposition microstructures were observed by KYKY 80 0 scanning electron microscope. The effects of different heat treatment processes on the microstructure and mechanical properties of Zn 2 7Al 2 7Cu 0 0 3Mg 0 5Mn alloy Impact. The results show that the addition of alloying elements increases the stability of subcooled β phase and shifts the TTT curve to the right. With appropriate heat treatment process can make the alloy toughening, tensile fracture by brittle intergranular fracture into dimple fracture.