半固态高压铸造AZ91D镁合金的显微组织与力学性能王 开1,何乃军1,翟彦博2,刘昌明1
Microstructure and Mechanical Properties of Semi-solid Die Casting AZ91D Magnesium Alloy
摘 要
通过降低浇注温度来制备半固态料坯,再将料坯重熔至半固态,最后运用高压铸造技术成型摩托车用AZ91D镁合金零件:用光学显微镜、拉伸试验机和硬度仪等研究了成型零件的显微组织和力学性能.结果表明:半固态料坯的组织由初生α-Mg相、次生α相和γ-Mg17Al12相共晶组织构成,降低浇注温度可使组织细化:重熔后组织由未熔的α-Mg固熔体和部分液相转变相组成:经过半固态高压铸造成型后,零件显微组织由未熔的α-Mg相与网状分布的共晶相组成:用该工艺制备零件的力学性能受到组织缺陷和铸件内部缺陷的影响较大,需要进一步优化半固态成型工艺.
显微组织
半固态高压铸造
力学性能
AZ91D magnesium alloy
microstructure
semi-solid die casting
mechanical property
Abstract
The semi-solid billet was first fabricated by decreasing pouring temperature,then remelted to semi-solid,and a AZ91D Mg alloy component for motor by high pressure casting process was at last formed.The microstructure and mechanical properties of the component were investigated by using optical microscopy,tensile tester and hardness tester.The results show that the semi-solid billet was composed of primary α-Mg phase,secondary α phase and γ-Mg17Al12 eutectic phase.Decreasing the pouring temperature could refine the microstructure.The remelted structure was composed of unmelted α-Mg solid solution and partial liquid transformation phase.After semi-solid die casting process,the microstructure was composed of α-Mg phase and net distributed eutectic phase.The effects of microstructure defects and casting internal defects on mechanical properties of the component prepared by the process were remarkable,therefore the semi-solid die casting process needed to be optimized further.
中图分类号 TG146.2
所属栏目 试验研究
基金项目 重庆市自然科学基金资助项目(CSTC,2008BB4177)
收稿日期 2009/2/24
修改稿日期 2009/9/1
网络出版日期
作者单位点击查看
备注王开(1976-),男,四川南充人,讲师,博士.
引用该论文: WANG Kai,HE Nai-jun,ZHAI Yan-bo,LIU Chang-ming. Microstructure and Mechanical Properties of Semi-solid Die Casting AZ91D Magnesium Alloy[J]. Materials for mechancial engineering, 2010, 34(3): 1～4
王开,何乃军,翟彦博,刘昌明. 半固态高压铸造AZ91D镁合金的显微组织与力学性能王 开1,何乃军1,翟彦博2,刘昌明1[J]. 机械工程材料, 2010, 34(3): 1～4
被引情况:
【1】郭惠霞,马颖,董海荣,张玉福,郝远, "镁合金微弧氧化膜在乙二醇水溶液中的腐蚀行为",机械工程材料 37, 42-47(2013)
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【3】ZHEN Z,QIAN Ma,JI S,et al.The effects of rheo-diecasting on the integrity and mechanical properties of Mg-6Al-1Zn[J].Scripta Materialia,2006,54:207-211.
【4】KANG C G,JUNG Y J,YOUN S W.Horizontal reheating of aluminum alloys and semi-solid casting for a near net shape compressor component[J].Journal of Materials Processing Technology,2003,135:158-171.
【5】KOREN Z,ROSENSON H,GUTMAN E M,et al.Development of semisolid casting for AZ91 and AM50 magnesium alloys[J].Journal of Light Metals,2002,2:81-87.
【6】KOPP R,CHOI J,NEUNDENBERGER D.Simple compre-ssion test and simulation of an Sn-15%Pb alloy in the semi-solid state[J].Journal of Materials Processing Technology,2003,135:299-304.
【7】FREITAS E R,FERRACINI Jr E,FERRANTE M.Microstructure and rheology of an AA2024 aluminium alloy in the semi-solid state,and mechanical properties of a back-extruded part[J].Journal of Materials Processing Technology,2004,146:241-249.
【8】KOPP R,KALLWEIT J,MOLLER T,et al.Forming and joining of commercial steel grades in the semi-solid state[J].Journal of Materials Processing Technology,2002,130/131:562-568.
【9】LIU C M,ZOU M H.Effects of compressing and remelting in SIMA processing on semi-solid structure evolution of an Al-Zn wrought alloy[J].Rare Metals,2003,22(3):185-191.
【10】左宏志,刘昌明,邹茂华,等.ZL112Y压铸铝合金摩托车零件的半固态高压铸造成形[J].中国有色金属学报,2003,13(4):949-995.
【11】谭建波,邢书明,李立新,等.半固态A356合金微观组织特征对充型能力的影响[J].中国有色金属学报,2006,16(4):612-617.
【12】LASHKARI O,GHOMASHCHI R.The implication of rheo-logy in semi-solid metal processes: An overview[J].Journal of Materials Processing Technology,2007,182(1/3):229-240.
【13】BIROL Y.A357 thixoforming feedstock produced by cooling slope casting[J].Journal of Materials Processing Technology,2007,186(1/3):195-200.
【14】XIA K,TAUSIG G.Liquidus casting of a wrought aluminum alloy 2618 for thixoforming[J].Materials Science and Engineering A,1998,246:1-10.
【15】WANG Kai,LIU Chang-ming,HAN Zhao-tang.Reasearch on semi-solid thixiforing process of AZ91D magnesium alloy brackets for generators in JH70-type motorbikes[J].Rare Metals,2005,24(4):381-391.
【16】CZERWINSKI F.Near-liquidus molding of Mg-Al and Mg-Al-Zn alloys[J].Acta Materialia,2005,53:1973-1984.
【17】GAO M,WANG P,LU G,et al.Microstructures of an AlSi7Mg alloy by near-liquidus casting[J].Rare Metals,2007,26(3):226-229.
【18】胡汉起.金属凝固[M].北京:冶金工业出版社,1985:245.
【19】KLEINER S,BEFFORT O,WAHLEN A,et al.Microstructure and mechanical properties of squeeze cast and semi-solid cast Mg-Al alloys[J].Journal of Light Metals,2002(2):277-280.
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