织构及组织结构对超高强铝合金平面力学性能的影响

发布时间：2018-08-30 13:05

【摘要】：以自行制备的高合金含量的Al-Zn-Mg-Cu合金为试验材料,测试观察挤压带板及其制备的等温模锻件的织构类型及组分强度、组织结构、平面拉伸力学性能及各向异性指数,通过计算{111}112滑移系的施密特因子,采用单晶近似法分析平面拉伸力学性能各向异性与织构的关系,使用霍尔-佩奇定律分析了组织结构与平面拉伸力学性能各向异性的关系,结果表明:合金经剧烈变形后,以变形织构为主,变形织构会引起各向异性,导致合金45°方向强度偏低;挤压形成的纤维组织是引起挤压带板L向及LT向各向异性的主要原因。{110}112Brass织构强度增加,可以抵消纤维组织引起的L向及LT向的各向异性;LT向伸长率低及伸长率各向异性主要是由第二相粒子延晶界的链状分布引起,同时也与织构引起的晶粒强度变化有很大关系。
[Abstract]:The texture type, component strength, microstructure, plane tensile mechanical properties and anisotropy index of the extruded strip plate and its isothermal die forgings were measured and observed by using Al-Zn-Mg-Cu alloy with high alloy content prepared by ourselves. By calculating the Schmitt factor of {111} 112 slip system, the relationship between anisotropy and texture of plane tensile mechanical properties is analyzed by single crystal approximation method, and the relationship between microstructure and anisotropy of plane tensile mechanical properties is analyzed by using Hall Page's law. The results show that the deformation texture is the main deformation texture after severe deformation, and the deformation texture will cause anisotropy, which leads to the low strength of the alloy in 45 掳direction. The fiber structure formed by extrusion is the main cause of anisotropy in L and LT directions of extruded strip plates. {110} 112Brass texture strength increases, It can counteract the anisotropy of L direction and LT direction caused by fiber structure. The low elongation in LT direction and the anisotropy of elongation are mainly caused by the chain distribution of the second phase particle extending grain boundary, and it is also related to the change of grain strength caused by texture.
【作者单位】：北京航空材料研究院;北京市先进铝合金材料及应用工程技术研究中心;
【分类号】：TG146.21

【参考文献】