CAJ | 학술논문

对含Sr(0.05%~0.6%)AZ91铸态镁合金组织进行了观察,并且采用“边-边匹配”模型研究了其细化机制。结果表明,微量 Sr 对 AZ91铸态组织有明显的晶粒细化效果,Sr含量为0.05%时细化效果最为显著。通过“边-边匹配”模型计算,得到[021]Al4 Sr∥[1-10]Mg17 Al12,(200)Al4Sr∥(332)Mg17 Al12,表明微量 Sr对AZ91镁合金铸态晶粒细化主要是 Al4 Sr 相为Mg17 Al12相的形成提供有效的异质形核核心,从而加速Mg17 Al12相对α-Mg枝晶长大的阻碍作用。
대함Sr(0.05%~0.6%)AZ91주태미합금조직진행료관찰,병차채용“변-변필배”모형연구료기세화궤제。결과표명,미량 Sr 대 AZ91주태조직유명현적정립세화효과,Sr함량위0.05%시세화효과최위현저。통과“변-변필배”모형계산,득도[021]Al4 Sr∥[1-10]Mg17 Al12,(200)Al4Sr∥(332)Mg17 Al12,표명미량 Sr대AZ91미합금주태정립세화주요시 Al4 Sr 상위Mg17 Al12상적형성제공유효적이질형핵핵심,종이가속Mg17 Al12상대α-Mg지정장대적조애작용。
As-cast microstructure and grain refinement in the AZ9 1 magnesium alloys with different Sr contents (0,0.05%,0.1%,0.3% and 0.6wt%)were observed in this paper,and the grain refining mechanism was an-alyzed by using the calculation of “edge-to-edge”matching model.The results indicated that adding trace Sr to as-cast AZ91 alloy had obviously effects on grain refinement,thereinto with the addition of 0.05% Sr was the most remarkable.In addition,the [021]Al4Sr∥[1-1 0]Mg17 Al12 and (200)Al4Sr∥(332)Mg17 Al12 were calculated by u-sing “edge-to-edge”matching model,which can provide an evidence that the Al4 Sr phase was the effective het-erogeneous nucleant for the Mg17 Al12 phase probably.However,the mechanism of grain refinement of trace Sr effect on the as-cast microstructure of AZ9 1 magnesium alloy was the Al4 Sr phase provide heterogeneous nucle-ant for the Mg17 Al12 phase that accelerating the formation of Mg17 Al12 phase and then restricted the growth ofα-Mg .