Mn和Zr对Al-Zn-Mg-Cu铝合金各向异性的影响  

Effect of Mn and Zr on the Anisotropy of Al-Zn-Mg-Cu Aluminum Alloy

作　　者：焦慧彬 陈善达 陈送义 陈康华 JIAO Huibin;CHEN Shanda;CHEN Songyi;CHEN Kanghua(Light Alloy Research Institute,Central South University,Changsha 410083;Collaborative Innovation Center of Advanced Nonferrous Structural Materials and Manufacturing,Central South University,Changsha 410083;Science and Technology on High Strength Structural Materials Laboratory,Central South University,Changsha 410083)

机构地区：[1]中南大学轻合金研究院,长沙410083 [2]中南大学有色金属先进结构材料与制造协同创新中心,长沙410083 [3]中南大学轻质高强结构材料重点实验室,长沙410083

出　　处：《材料导报》2018年第6期937-942,共6页Materials Reports

基　　金：国家重点研发计划(2016YFB0300801);国家重点基础研究计划(2012CB619502);国家自然科学基金(51201186);国家重大科研仪器设备研制专项(51327902)

摘　　要：采用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)以及室温拉伸、剥落腐蚀、晶间腐蚀等测试方法,研究了微量的Mn和Zr对Al-Zn-Mg-Cu铝合金的组织和性能各向异性的影响。结果表明,在Al-Zn-Mg-Cu-Ti合金中,分别添加微量的Mn和Zr,合金中对应析出细小弥散的Al6Mn和Al3Zr相,这两相均能抑制基体再结晶,促使合金的晶粒纵横比增大。合金的力学性能、抗晶间腐蚀和剥落腐蚀性能提高,但性能各向异性增大。同时,结果显示Zr对合金的组织和性能各向异性的影响显著大于Mn。The effect of Mn and Zr on the anisotropy of Al-Zn-Mg-Cu alloys was investigated by means of mechanical tensile,exfoliation corrosion and intergranular corrosion testing combined with optical microscopy(OM),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results showed that the tiny and diffuse Al 6 Mn,Al 3 Zr precipitations appeared in the alloys after the addition of Mn and Zr,which could inhibited the recrystallization of Al-Zn-Mg-Cu-Ti alloys and contri-buted to the increase of grain aspect ratio in the alloy.Therefore,the mechanical properties and the abilities of resistance to intergra-nular corrosion,exfoliation corrosion were improved,but the anisotropy of alloys was increased.Moreover,the results revealed that the effect of Zr on anisotropy of microstructure and properties in the alloy was significantly larger than that of Mn.

关 键 词：AL-ZN-MG-CU铝合金 MN ZR 各向异性 

分 类 号：TG146.2[一般工业技术—材料科学与工程]