Te对Al-7Si-0.3Mg合金组织和力学性能的影响  

Effect of Te on the Microstructure and Mechanical Properties of Al-7Si-0.3Mg Alloys

作　　者：刘辉[1] 杨淋[1] 罗琨[1] 张磊 尧军平[1] 

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室

出　　处：《特种铸造及有色合金》2014年第5期538-540,共3页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51164027);江西省教育厅2012年度科技计划资助项目(GJJ12432);南昌航空大学第八届"三小"科技创新基金项目;南昌航空大学科研基金资助项目(EA201403011)

摘　　要：采用Te对亚共晶Al-7Si-0.3Mg合金进行了变质处理,考察了加入量、熔体保持时间以及重熔次数对合金组织和力学性能的影响。结果表明,Te对Al-7Si-0.3Mg合金中的共晶Si相具有良好的变质作用。考虑到成本因素,Te的最佳加入量为0.1%左右时,共晶Si绝大部分转化为颗粒状,合金的抗拉强度和伸长率为240.1MPa和4.2%,相比未变质合金分别提高了31.1%和133.3%。熔体保持6h或经重熔3次后,Te变质的效果基本保持不变,表明Te具有良好的抗变质衰退和重熔特性,是一种长效变质剂。Effects of Te addition, holding time and remelting times on the microstructure and mechanical properties of Al-7Si-0.3Mg Alloy with Te modification were investigated. The results show that Te exhibits a satisfied modification effect on Al-7Si-0. 3Mg alloy. With 0. 1% Te addition, tensile strength and elongation of the alloy with major eutectic Si particles reach 240.1 MPa and 4.2%, respectively, increased by 31.1% and 133,3%, respectively, compared with those of un-modified alloy. After the alloy was modified for 6 h and remelted by 3 times,mechanical properties of the Te modified alloy keep a desirable state, which show Te exhibits satisfied anti-fading ability and anti-remelting behavior as a longduration modifier.

关 键 词：碲 Al—7Si-0 3Mg合金 变质处理 组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG146.435[金属学及工艺—金属材料]