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通过X射线衍射分析、金相分析和力学性能测试对大尺寸ZK60镁合金挤压型材的微观组织、织构取向和室温力学性能进行系统研究。结果显示,挤压态ZK60镁合金中主要由α-Mg和Mg Zn2相组成,此外还有少量的Mg2Zn11和Zn2Zr3相。挤压变形后初始的粗大铸态组织沿着挤压方向被极大地细化和破碎,同时伴有部分动态再结晶发生。大部分晶粒的基面沿着挤压方向和横向排列而不是常规的挤压纤维状取向分布。沿着45o方向取样展现出最好的断裂伸长率,其中间和边部分别为28%和23%,而最大抗力强度则体现在沿着挤压方向拉伸样品在中间和边部分别为325和312 MPa。
The microstructure, texture orientation and room temperature mechanical properties of large size ZK60 magnesium alloy extruded sections were systematically studied by X-ray diffraction analysis, metallographic analysis and mechanical properties test. The results show that the extruded ZK60 magnesium alloy is mainly composed of α-Mg and Mg Zn2 phases, in addition to a small amount of Mg2Zn11 and Zn2Zr3 phases. The initial coarse as-cast microstructure after extrusion deformation is greatly refined and broken along with the extrusion direction, accompanied by the partial dynamic recrystallization. The base of most of the grains is arranged along the extrusion direction and the transverse direction instead of the conventional extrusion fibrous orientation distribution. Sampling along the 45o direction showed the best elongation at break, with 28% and 23%, respectively, in the center and at the sides, whereas the maximum resistance strength was found in the middle and at the side 325 and 312 MPa.