Al-5Ti-1B对Al-Zn-Mg-Cu合金铸态组织与力学性能的影响  

Effect of Al-5Ti-1B on microstructure and mechanical properties of as-cast Al-Zn-Mg-Cu alloy

作　　者：郑开宏[1] 王顺成[1] 徐静[1] 胡权 黄志其 刘志铭 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院)金属加工与成型技术研究所,广东广州510650 [2]佛山市三水凤铝铝业有限公司,广东佛山528133

出　　处：《兵器材料科学与工程》2014年第4期36-40,共5页Ordnance Material Science and Engineering

基　　金：广东省科技厅产学研结合项目(2012B090600051;2012B091100475);佛山市重大科技专项项目(2013AH100055)

摘　　要：研究了电磁搅拌连续铸挤Al-5Ti-1B晶粒细化剂对Al-Zn-Mg-Cu合金铸态组织与力学性能的影响。结果表明:Al-5Ti-1B是Al-Zn-Mg-Cu合金的有效晶粒细化剂,添加质量分数为0.1%的Al-5Ti-1B,可使Al-Zn-Mg-Cu合金铸态组织从粗大的枝晶细化为平均直径为54μm的等轴晶,抗拉强度和伸长率提高5.5%和35.6%;随着Al-5Ti-1B的质量分数从0.1%增加至0.5%,Al-Zn-Mg-Cu合金的晶粒进一步细化,抗拉强度和伸长率继续提高;当Al-5Ti-1B的质量分数为0.5%时,Al-Zn-Mg-Cu合金被细化为平均直径为38μm的等轴晶,合金的抗拉强度和伸长率提高到313 MPa和4.2%,与未添加Al-5Ti-1B相比,分别提高了13.8%和48.2%。The effects of Al-5Ti-1B grain refiner on microstructure and mechanical properties of as-cast Al-Zn-Mg-Cu alloy were studied. Results show that the Al-5Ti-1B is an efficient grain refiner of Al-Zn-Mg-Cu alloy. When the additive amount of Al-5Ti-1B grain refiner is 0.1%, the microstructure of Al-Zn-Mg-Cu alloy can be refined from coarse dendrite to equiaxed grains with average diameter 54 p.m and the tensile strength and elongation are increased by 5.5% and 35.6%, respectively. With the increase of additive amount of Al-5Ti-1B grain refiner from 0.1% to 0.5%, the grains of Al-Zn-Mg-Cu alloy are further refined and the tensile strength and elongation are further improved. When the additive amount of Al-5Ti-1B grain refiner is increased to 0.5%, the grains of Al-Zn-Mg-Cu alloy are refined to equiaxed grains with average diameter 38 μm and the tensile strength and elongation are improved to 313 MPa and 4.2%, respectively, which are increased by 13.8% and 48.2% compared with that of Al- Zn-Mg-Cu alloy without adding Al-5Ti-1B grain refiner.

关 键 词：AL-ZN-MG-CU合金 Al-5Ti-1B细化剂 晶粒细化 电磁搅拌 连续铸挤 

分 类 号：TG146.21[一般工业技术—材料科学与工程]