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采用OM、SEM、TEM和电子万能试验机系统地研究了时效处理对挤压态Mg_(94)Y_4Ni_2合金微观组织和力学性能的影响。结果表明,挤压态合金由α-Mg基体和平行于挤压方向的条状18R-LPSO相组成,合金经过225℃/30 h峰值时效处理后,α-Mg基体内部析出大量β’共格沉淀相。时效态合金的极限抗拉强度达到446 MPa,比挤压态合金进一步提高,但塑性略有下降。断口扫描观察表明,合金的失效模式由挤压态合金的α-Mg相破坏转变为时效态合金中18R-LPSO相分层破坏。
The effects of aging treatment on the microstructure and mechanical properties of Mg_ (94) Y_4Ni_2 alloy were studied systematically by OM, SEM, TEM and electronic universal testing machine. The results show that the extruded alloy consists of α-Mg matrix and strip 18R-LPSO phase parallel to the extrusion direction. After 225 ℃ / 30 h peak aging treatment, a large amount of β ’coherent Precipitates. The ultimate tensile strength of the aged alloy reaches 446 MPa, which is higher than that of the extruded alloy, but the plasticity slightly decreases. Fracture scanning observations show that the failure mode of the alloy changes from the α-Mg phase of the as-extruded alloy to the delamination of the 18R-LPSO phase in the aged alloy.