对常规压铸(DC)和真空压铸(VDC) Al-Mg-Si-Mn合金平板铸件的微观组织、力学性能和疲劳性能进行研究,并且用SEM和EDS等手段分析了断口形貌.结果表明:Al-Mg-Si-Mn合金的微观组织主要由初生α-Al,[Al+ Mg2Si]共晶区以及Al15(Fe,Mn)3Si2颗粒构成.常规压铸试样和真空压铸试样的抗拉强度(Rm)、屈服强度(Rp02)、弹性模量(E)和伸长率(A)分别为321 MPa,205 MPa,54 MPa和3.9％,以及331 MPa,210 MPa,55 MPa和4.4％.真空压铸试样的裂纹扩展速率曲线斜率(2.824)低于常规压铸试样(3.693),因而真空压铸试样的抗疲劳性能较好.试样的拉伸断口显示出大量脆性断裂特点即解理平面,而疲劳断口则可清晰观察到疲劳条纹和撕裂棱.
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