Effect of Ca addition on grain refinement of Mg–9Li–1Al alloy  

作　　者：Ying Zeng Bin Jiang Dehui Huang Jiahong Dai Fusheng Pan 

机构地区：[1]National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400030,China [2]Advanced Materials Center,Chongqing Academy of Science and Technology,Chongqing 401123,China

出　　处：《Journal of Magnesium and Alloys》2013年第4期297-302,共6页镁合金学报（英文）

基　　金：The authors are grateful for the financial supports from National Natural Science Foundation of China(51171212);Chongqing Science and Technology Commission(CSTC2012JJJQ50001,CSTC2013jcyjC60001,cstc2012ggB 50003);The National Science and Technology Program of China(2013DFA71070);the Fundamental Research Funds for the Central Universities(CDJZR13138801).

摘　　要：The as-cast and as-extruded Mg–9Li–1Al–xCa alloys(x=0,0.2;wt%)were prepared by a simple alloying process followed by hot extrusion with an extrusion ratio of 28.2.The microstructures of the as-cast and as-extruded Mg–9Li–1Al–xCa alloys were observed to investigate the effect of calcium(Ca)element on the Mg–9Li–1Al(LA91)alloy,and the crystallographic calculations between Al_(2)Ca and the matrix(α-Mg andβ-Li phases)were examined on the basis of the edge-to-edge matching model.The experimental results indicate that the addition of 0.2 wt%Ca into LA91 alloy reduce the size of theα-Mg phases in the as-cast alloy and that ofβ-Li phases in the as-extruded alloy due to the Al_(2)Ca particles distributed inside the matrix.Crystallographic calculation results suggested that there is a good crystallographic matching between the matrix and Al_(2)Ca,which confirmed that Al_(2)Ca particles can act as a heterogeneous nucleation site for bothα-Mg andβ-Li phases and were effective grain refiners for LA91 alloy.

关 键 词：Mg-9Li-1Al alloy(LA91) CALCIUM REFINEMENT Edge-to-edge matching model 

分 类 号：TG1[金属学及工艺—金属学]