等径角挤压是一种有效的控制金属和合金显微组织和织构的技术。采用X射线衍射仪和取向成像显微镜评价通过90°模具反复等径角挤压7075铝合金的显微组织和织构。定性和定量分析结果表明,不同的路径会产生不同的织构类型。利用Labotex软件计算的织构表明,经第1道次等径角挤压后合金织构增强,而经第4道次挤压后合金织构减弱。显微组织研究表明,经过Bc和A路径等径角挤压4道次后,出现了平均尺寸分别为700 nm和1μm的细小晶粒,且大多数晶粒演化为大角度晶界排列。研究了铜管包覆对7075铝合金显微组织和织构的影响。 Isometric angular extrusion is an effective technique for controlling the microstructure and texture of metals and alloys. X-ray diffractometry and oriented imaging microscopy were used to evaluate the microstructure and textures of 7075 aluminum alloy extruded by repeated isocenter of 90 ° mold. Qualitative and quantitative analysis of the results show that different path will produce different types of texture. The textures calculated by Labotex software show that the texture of the alloy increases after the first pass of equal path angle extrusion and weakened after the fourth pass. Microstructural studies show that after 4 passes of equal path angle Bc and A paths, fine grains with average sizes of 700 nm and 1 μm respectively appear, and most of the grains evolve into large-angle grain boundaries. The effect of copper clad on microstructure and texture of 7075 aluminum alloy was studied.