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采用光学显微镜、显微硬度仪、拉伸试验机、X射线衍射仪和透射电镜,分析了0.2%钪对7050铝合金和未添加钪元素的铝合金显微组织、力学性能和钪在热处理中的作用机理。结果表明:在480℃固溶处理+120℃低温时效热处理后,含0.2%钪铝合金晶粒明显细化,且不易过时效软化。其硬度达200 HV,抗拉强度达679 MPa。0.2%钪铝合金的强化机制是通过高温的Al_3Sc弥散相和低温MgZn_2析出相双重作用达到强化效果。
The microstructure of aluminum alloy with 70% aluminum alloy and non-added scandium with 0.2% scandium was analyzed by optical microscope, microhardness tester, tensile tester, X-ray diffractometer and transmission electron microscope. The mechanical properties and scandium in the heat treatment The mechanism of action. The results show that the grain size of 0.2% scandium-aluminum alloy is obviously refined after 480 ℃ solution treatment + 120 ℃ aging heat treatment, and it is not easy to soften after aging. The hardness of 200 HV, tensile strength of 679 MPa. The strengthening mechanism of 0.2% scandium-aluminum alloy is achieved through the dual action of the high-temperature Al 3 Sc dispersion and the low-temperature MgZn 2 precipitation phase.