高剪切速率下半固态法制备镁合金工艺的优化
Study on Semi-solid Preparation Process Optimization of Magnesium Alloy in High Shear Rate
摘 要
采用正交试验方法、半固态流变压铸成形工艺和高剪切速率双螺杆机械搅拌机,对半固态法制备镁合金工艺进行了优化.结果表明:搅拌机筒体温度对半固态浆料固相率和初生α-Mg相圆整度的影响最大,双螺杆剪切速率对初生α-Mg相晶粒平均尺寸的影响最大;试验条件下的最佳工艺参数为镁液浇注温度605 ℃,筒体温度575 ℃,螺杆剪切速率6 830 s-1;所得镁合金的力学性能σb＝216 MPa,δ＝2.3%,硬度74 HB.
镁合金
双螺杆
微观组织
力学性能
semi-solid
magnesium alloy
twin-screw
microstructure
mechanical property
Abstract
The semi-solid preparation process optimization of magnesium alloy had been studied by positive alternation method with rheo-diecasting process and twin-screw in high shear rate.The results shows that the solid fraction of semi-solid slurry and the round degree of primary α-phase are intensively influenced by barrel temperature of screw mixer,and the primary grain size is mainly controlled by shear rate of twin-screw.The pertinent processing parameters are summarized as follows:pouring temperature of the Mg melt is 605 ℃;barrel preheating temperature is 575 ℃ and shear rate is 6 830 s-1.The tensile strength,elongation and hardness of semi-solid AZ91D alloy are 216 MPa,2.3％ and 74 HB.
中图分类号 TG146.2
所属栏目
基金项目 湖北省重点科技计划资助项目(20002P0304);科技部中小企业技术创新基金资助项目(01C26214200911)
收稿日期 2005/10/17
修改稿日期 2006/1/21
网络出版日期
作者单位点击查看
备注李东南(1967-),男,江西南昌人,副教授,博士.
引用该论文: LI Dong-nan,CHEN Ding-gui,WU Shu-sen,LUO Ji-rong. Study on Semi-solid Preparation Process Optimization of Magnesium Alloy in High Shear Rate[J]. Materials for mechancial engineering, 2006, 30(11): 10～12
李东南,陈丁桂,吴树森,罗吉荣. 高剪切速率下半固态法制备镁合金工艺的优化[J]. 机械工程材料, 2006, 30(11): 10～12
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参考文献
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【2】Byton B C.Magnesium industry overview[J].Advanced Materials & Processes,1996,(11):9-16.
【3】Robert E.Magnesium alloys and their applications[J].Light Metal Age,2001,(6):54-56.
【4】吕宜振,曾小勤,丁文江.镁合金铸造成形技术的发展[J].铸造,2000,49(7):383-387.
【5】Fan Z.Semi-solid metal processing[J].International Materials Reviews,2002,47(2):49-85.
【6】甄子胜,毛卫民,赵爱民,等.半固态镁合金的研究进展[J].特种铸造及有色合金,2001,(6):32-35.
【7】Watari H,Davey K,Rasgado M T,et al.Semi-solid manufacturing process of magnesium alloy by twin-roll casting[J].Journal of Materials Processing Technology,2004,155-156(10):1662-1667.
【8】李元东,郝 远,阎峰云.SIMA法制备AZ91D镁合金非枝晶组织锭料[J].甘肃工业大学学报,2002,28(2):34-38.
【9】Kamado S,Yuasa A,Hitoim,et al.Effects of stirring conditions on structure and apparent viscosity of semi-solid AZ91D magnesium alloy[J].Japan Institute of Light Metals,1992,42(12):734-740.
【10】崔建忠,路贵民,刘 丹,等.半固态浆料制备技术的新进展[J].哈尔滨工业大学学报,2000,32(4):110-113.
【11】Kanfmann H,Potzinger R.An update on the new rheocasting-development work for Al- and Mg-alloy[J].Die-casting Engineer,2002,(7):16-19.
【12】周国利,况 山.概率论与数理统计[M].重庆:重庆大学出版社,2004.
【13】张永忠,张 奎,崔代金,等.AZ91D镁合金的压铸工艺及性能[J].铸造,2000,(2):74-76.
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