自制覆盖剂在熔炼含铈AZ91D镁合金中的使用效果
Application Effect of Self-made Covering Flux in Melting Cerium-Containing AZ91D Magnesium Alloy
摘 要
开发了镁合金用变质处理和防氧化功效合二为一的新型覆盖剂,采用热分析仪、光学显微镜、力学性能试验机、X射线衍射仪等研究了自制NRJ覆盖剂对熔炼含铈AZ91D镁合金铸态显微组织和力学性能的影响,并与传统RJ2覆盖剂进行了对比.结果表明:含铈AZ91D镁合金采用NRJ覆盖剂熔炼后,合金组织中Mg17Al12相得到了细化,晶内出现了Al4C3形核质点,促进了基体晶粒细化;合金的抗拉强度、屈服强度及伸长率分别提高了36%,32%和146%,且拉伸断口中韧窝更多、更深;防氧化性能比用传统RJ2覆盖剂的更好.
覆盖剂
显微组织
cerium-containing AZ91D magnesium alloy
covering flux
microstructure
Abstract
A new kind of covering flux with the functions of modification and anti-oxidation was developed.The effect of self-made covering flux NRJ on as-cast microstructure and mechanical properties of the melting cerium-containing AZ91D magnesium alloy was analyzed by using thermal analyzer,optical microscopy,mechanical property tester and XRD.Then it was compared with the coventional covering flux RJ2.The results show that the Mg17Al12 phase in the alloy after melting with NRJ as covering flux were refined.The nuclear particles of A14C3 were formed in the grains and promoted the matrix grain refining.The tensile strength,yield strength and elongation of the alloy were increased by 36%,32% and 146%,and the tensile fracture had more and deeper dimples.The oxidation resistance properties of the alloy were better than those of the alloy melted with conventional covering flux RJ2.
中图分类号 TG146.2
所属栏目 新材料 新工艺
基金项目
收稿日期 2009/6/19
修改稿日期 2010/3/20
网络出版日期
作者单位点击查看
备注刘赣伟(1966-),男,广东梅州人,副教授,学士.
引用该论文: LIU Gan-wei,LI Yong,XIE Jun. Application Effect of Self-made Covering Flux in Melting Cerium-Containing AZ91D Magnesium Alloy[J]. Materials for mechancial engineering, 2010, 34(8): 39～42
刘赣伟,李勇,谢骏. 自制覆盖剂在熔炼含铈AZ91D镁合金中的使用效果[J]. 机械工程材料, 2010, 34(8): 39～42
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