作　　者： ; ; ; ; ; ; ; ;

机构地区： 西北工业大学材料学院

出　　处： 《特种铸造及有色合金》 2012年第6期505-507,共3页

摘　　要： 研究了微量元素Zr的添加方式对喷射沉积超高强铝合金性能的影响。金相显微镜、扫描电镜和拉伸试验结果表明,采用Al-Zr中间合金形式加入到铝合金中的合金组织中存在粗大的Al-Zr未溶相,尺寸在5～30μm之间,一般呈长条形,且中间合金中Zr含量越多,未溶的Al-Zr相越多越粗大;若采用Zr颗粒的形式加入铝合金中,则铝合金组织中未出现未溶相;拉伸断口分析表明,粗大的Al-Zr未溶相成为裂纹的萌生处,严重影响铝合金的力学性能。拉伸试验结果表明,以Al-Zr中间合金形式加入,合金的抗拉强度只有710MPa,伸长率为3.5%;以Zr颗粒方式加入,合金的抗拉强度和伸长率分别达到了820MPa和5%。 Effects of minor Zr additions on the microstructure and mechanical properties of super-high strength Al alloys by spray forming were investigated by optical microscope（OM）,scanning electron microscope（SEM） and transmission electron microscopy（TEM）.The results show that there exists coarse non-dissolve phases with the size from 5 μm to 30 μm and the strip-like morphology in the alloys with Al-Zr master alloy addition.The size of coarse phases is increased with the increase of Zr in the master alloys.Absence of coarse phases in the alloys with the Zr addition in form of pure particles can be observed.The fracture analysis shows that the coarse phases are the initiation resource of cracks,leading to the deterioration of the mechanical properties severely.The tensile strength and elongation are 820 MPa and 5%,respectively,of the alloy with the Zr addition in form of pure particle while their are 710MPa and 3.5%,respectively,of one with Zr addition in form of Al-Zr master alloys.

关 键 词： 喷射沉积 力学性能 微观组织 中间合金

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺] [金属学及工艺] [一般工业技术] [金属学及工艺]