Influences of electric pulse on solidification structure of LM-29 Al-Si alloy  

作　　者：He Lijia Wang Jianzhong Qi Jingang Du Huiling Zhao Zuofu 

机构地区：[1]College of Material Science and Engineering, Liaoning University of Technology, Jinzhou 121001, China

出　　处：《China Foundry》2010年第2期153-156,共4页中国铸造（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 50674054);the Doctorate Foundation of Science and Technology Department,Liaoning Province (20081097)

摘　　要：The metallographic structure of LM-29 aluminum-silicon alloy modified by electric pulse treatment has been investigated and compared with those untreated.The solidification structure of LM-29 alloy has been analyzed by means of M1AP3 Quantimet image processing and analysis system,and then the solidification process has been analyzed by means of differential scanning calorimetry(DSC).The results indicate that the primary silicon phase was refined remarkably by electric pulse while the tensile strength and elongation properties increased accordingly.Electric pulse treatment can also increase the binding power between silicon clusters and alloy melt matrix,as a result,the precipitation of primary silicon phase is suppressed to meet the demand of supercooling degree for nucleating,correspondingly.The electric pulse modification has great influence on the size of silicon atomic cluster as well as its distribution in the melt,subsequently,leads to the refinement of solidification structure.The metallographic structure of LM-29 aluminum-silicon alloy modified by electric pulse treatment has been investigated and compared with those untreated.The solidification structure of LM-29 alloy has been analyzed by means of M1AP3 Quantimet image processing and analysis system,and then the solidification process has been analyzed by means of differential scanning calorimetry（DSC）.The results indicate that the primary silicon phase was refined remarkably by electric pulse while the tensile strength and elongation properties increased accordingly.Electric pulse treatment can also increase the binding power between silicon clusters and alloy melt matrix,as a result,the precipitation of primary silicon phase is suppressed to meet the demand of supercooling degree for nucleating,correspondingly.The electric pulse modification has great influence on the size of silicon atomic cluster as well as its distribution in the melt,subsequently,leads to the refinement of solidification structure.

关 键 词：electric pulse modification LM-29 alloy primary phase CLUSTER 

分 类 号：TG146.21[一般工业技术—材料科学与工程]