杨伟,殷海眯,聂海明,余欢.SiC颗粒参与下亚快速凝固镁合金组织与性能研究[J].稀有金属材料与工程,2017,46(10):3146~3150.[Yang Wei,Yin Haimi,Nie Haiming,Yu Huan.Microstructure and Property of Sub-rapid Solidified Magnesium Alloy Containing SiC Particle[J].Rare Metal Materials and Engineering,2017,46(10):3146~3150.]
SiC颗粒参与下亚快速凝固镁合金组织与性能研究
投稿时间:2015-08-03  修订日期:2015-09-18
中文关键词:  非平衡凝固  异质形核  晶粒细化  镁合金
基金项目:国家自然科学基金资助(51461032, 51164028),江西省教育厅青年基金(GJJ14504), 轻合金加工科学与技术国防重点学科实验室开放课题(GF201201003)
中文摘要:
      采用真空感应熔炼与阶梯型铜模喷铸相结合方式,制备出SiC颗粒参与AZ91镁合金非平衡凝固试样,研究了异质颗粒含量与铜模冷速协同作用下亚快速凝固合金的组织演化规律。结果表明,相同铜模内径条件下,SiC颗粒的加入可以有效细化镁合金的凝固组织。400℃固溶处理后,晶界处β-Mg17Al12相消失,初生α-Mg晶粒由细小粒状分布向多边形组织发生转变。由于SiC颗粒对晶粒长大的钉扎效应,保温2h后原始细晶组织得以保存,晶粒尺寸趋于均匀。随铜模内径降低,冷却速度增大,合金细化效果更加明显。当SiC含量2wt%,铜模内径2mm时,非平衡凝固镁合金的显微硬度值最高,可达142Hv,相比铸态提高了87%。
Microstructure and Property of Sub-rapid Solidified Magnesium Alloy Containing SiC Particle
英文关键词:Non-equilibrium solidification  heterogeneous nucleation  grain refinement  magnesium alloy
英文摘要:
      Adopting vacuum induction melting and step copper mould casting method, non-equilibrium solidified AZ91 magnesium alloy containing SiC particle was fabricated. Then, the microstructure evolution regularity of sub-rapid solidified alloys was revealed considering the effects of heterogeneous particle and cooling rate. In the condition of same inner diameter of copper mould, the addition of SiC particle is beneficial for the refinement of magnesium alloy. After solid solution treatment at 400℃, the β-Mg17Al12 phase at the grain boundary disappears gradually, accompanied by the morphology transition of primary α-Mg from fine granular to polygonal structure. Due to the pinning effect of SiC for grain growth at higher temperature, the initial refined microstructure can be saved after 2h and the whole grain size distribution becomes homogeneous. With decreasing the diameter of copper mould, the cooling rate during solidification is increased and the grain refinement is enhanced as well. As for the specimen with the addition of 2wt% SiC and diameter of 2mm, maximum hardness with the value of 142Hv can be obtained, which is increased by 87% in comparison with the as-cast alloy.
作者单位E-mail
杨伟 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 nchkyw@163.com 
殷海眯 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  
聂海明 中航工业中航金属材料理化检测科技有限公司  
余欢 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  
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