Effect of Rotating Magnetic Field on the Microstructure and Shear Property of Al/Steel Bimetallic Composite by Compound Casting  

作　　者：Weize Lv Guowei Zhang Heqian Song Dan Zhang Shiyuan Liu Hong Xu 

机构地区：[1]School of Materials Science and Engineering,North University of China,Taiyuan 030051,China [2]Shanxi Diesel Engine Industry Co.Ltd,Datong 037036,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第2期276-286,共11页金属学报(英文版)

基　　金：supported by the Natural Science Foundation of Shanxi Province(202103021224193).

摘　　要：Al/steel bimetallic composites were prepared by compound casting,and the effects of the rotating magnetic field on the interfacial microstructure and shear property of bimetallic composite was investigated.The application of rotating magnetic field refined the grain structure of the Al alloy matrix,changed the eutectic Si morphology from coarse lath to needle-like.The rotating magnetic field improved the temperature field and solute distribution of the Al alloy melt,enriched a layer of Si at the interface,and suppressed the growth of intermetallic compounds,the thickness of the interface layer decreased from 44.9μm to 22.8μm.The interfacial intermetallic compounds consisted ofη-Al_(5)Fe_(2),θ-Al_(13)Fe_(4),τ6-Al_(4.5)FeSi,τ_(5)-Al_(8)Fe_(2)Si andτ_(3)-Al_(2)FeSi,and the addition of the rotating magnetic field did not change phase composition.The rotating magnetic field improved the stress distribution within the interfacial intermetallic compounds,the presence of high-angle grain boundaries retarded crack extension,and the shear strength was enhanced from 31.27±3 MPa to 52.70±4 MPa.This work provides a feasible method for preparing Al/steel bimetallic composite with good bonding property.

关 键 词：Al/steel bimetallic composite Rotating magnetic field Intermetallic compounds Interface Compound casting 

分 类 号：TG376[金属学及工艺—金属压力加工]