吹气净化对AZ91D合金铸态组织与力学性能的影响
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摘要
利用光学显微镜和扫描电子显微镜分析了经不同参数氩气吹气净化前后的AZ91D合金铸态组织,并测试了其拉伸力学性能。结果表明:吹气净化能有效去除AZ91D合金熔体中的夹杂物。随着通气速率和通气时间的增加,合金的拉伸力学性能先显著提高后稍降低。经通气速率为3 L/min和通气时间为5 min吹气净化后的合金综合力学性能最佳,室温抗拉强度σ_b达到200 MPa,较未净化时提高10%;高温σ_b和δ分别达到198 MPa和17.0%,较未净化时分别提高11%和48%。
The as-cast microstructure of AZ91 D alloy before and after blowing purification with different parameters of argon gas was studied by optical microscopy and scanning electron microscopy.Meanwhile,the tensile mechanical properties were tested.The results show that the inclusions in AZ91 D alloy melt can be eliminated effectively by blowing purification.With the increase of the ventilation rate and ventilation time,the tensile mechanical properties of the alloy firstly increase significantly,and then decrease slightly.The AZ91 D alloy has the best comprehensive mechanical properties when the melt is treated by blowing purification with ventilation rate of 3 L/min and ventilation time of 5 min.The tensile strength σ_b at room temperature is 200 MPa,which increases by 10% compared with the alloy without blowing purification.The σ_b and δ at high temperature reach 198 MPa and 17.0% respectively,which increase by 11% and 48% respectively compared with the alloy without blowing purification.
The as-cast microstructure of AZ91 D alloy before and after blowing purification with different parameters of argon gas was studied by optical microscopy and scanning electron microscopy.Meanwhile,the tensile mechanical properties were tested.The results show that the inclusions in AZ91 D alloy melt can be eliminated effectively by blowing purification.With the increase of the ventilation rate and ventilation time,the tensile mechanical properties of the alloy firstly increase significantly,and then decrease slightly.The AZ91 D alloy has the best comprehensive mechanical properties when the melt is treated by blowing purification with ventilation rate of 3 L/min and ventilation time of 5 min.The tensile strength σ_b at room temperature is 200 MPa,which increases by 10% compared with the alloy without blowing purification.The σ_b and δ at high temperature reach 198 MPa and 17.0% respectively,which increase by 11% and 48% respectively compared with the alloy without blowing purification.
引文
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[16]Horstemeyer MF,Yang N,Ken Gall,etal.Highcycle fatigue of a die cast AZ91E-T4 magnesium alloy[J].Acta Materialia,2004,52(5):1327-1336.
[2]Haitani T,Tamura Y,Motegi T,et al.Solubility of iron in pure magnesium and cast structure of Mg-Fe alloy[J].Materials Science Forum,2003,419:697-702.
[3]Haitani T,Tamura Y,Motegi T,et al.Solubilityof iron into pure magnesiumand Mg-Alalloymelts[J].Journalof Japan Instituteof Light Metals,2002,52(12):591-597.
[4]吴国华,翟春泉,曾小勤,等.AZ91镁合金废旧料净化技术研究[C]//第三届有色合金及特种铸造国际会议论文集.上海,2003:103-110.
[5]Wu GH,Dai J C,Sun M,et al.Non-flux purification behavior of AZ91 magnesium alloy[J].Transactions of Nonferrous Metals Societyof China,2010,20(11):6-14.
[6]许四祥,吴树森,高培青.工艺参数对镁合金熔液除气精炼的影响[J].中国有色金属学报,2009,19(2):23-27.
[7]陈广告,靳玉春.旋转喷吹Ar精炼对镁合金性能的影响[J].铸造设备研究,2008,29(6):18-21.
[8]李英虹,许光明,崔建忠.电磁场对镁合金熔体的净化作用[J].轻合金加工技术,2008,26(7):19-22.
[9]赵宇昕,王朝辉,李淑波,等.超声处理对AZ31镁合金组织和性能的影响[J].特种铸造及有色合金,2010,30(7):10-11.
[10]曾月梅,汤铁装,周剑,等.劣质高危废镁真空蒸馏回收[J].铸造,2012,61(2):104-107.
[11]吴国华,孙明,王玮,等.镁合金纯净化研究新进展[J].中国有色金属学报,2010,20(6):7-17.
[12]杨长贺.面向21世纪的铝液除氢净化技术[J].特种铸造及有色合金,1999(S1):109-110.
[13]范晓明,万朋,文红艳.Mn含量对含铁AZ91镁合金铸态组织与性能的影响[J].中国铸造装备与技术,2008,42(6):16-18.
[14]Sin S L,DubéD,Tremblay R.Characterization of Al-Mn particles in AZ91D investment castings[J].Materials Characterization,2007,58(10):989-996.
[15]Wang J,Zhou J X,Tong W H,et al.Effect of purification treatment on propertiesof Mg-Gd-Y-Zr alloy[J].Transactions of Nonferrous Metals Societyof China,2010,20(7):62-66.
[16]Horstemeyer MF,Yang N,Ken Gall,etal.Highcycle fatigue of a die cast AZ91E-T4 magnesium alloy[J].Acta Materialia,2004,52(5):1327-1336.