Microstructure characteristics and thermodynamic properties of A357-SiCp/A357 layered composites prepared by semi-solid vacuum stirring suction casting  

作　　者：Zhen-lin Zhang Ying Xiao Jun Xu Feng-liang Tan Li Wang Min He 

机构地区：[1]Hunan Province Aluminum Alloy Semi-solid Forming Engineering Technology Research Center,Loudi 417000,Hunan,China [2]Hunan University of Humanities,Science and Technology,Loudi 417000,Hunan,China

出　　处：《China Foundry》2023年第2期108-114,共7页中国铸造（英文版）

摘　　要：A357-SiCp/A357 layered composites were prepared using a semi-solid vacuum stirring suction casting method.The microstructures,mechanical properties,and thermal conductivities of the composites fabricated under different suction casting processes were compared.Additionally,the microstructural evolution characteristics and performance enhancement mechanism of the A357-SiCp/A357 layered composites were discussed.The results demonstrate that suction casting at 610°C with a low solid phase ratio can significantly enhance the material density and reduce the agglomeration of SiCp.The A357-SiC_(p)/A357 interface is clear and straight with good bonding.With an increase in the suction casting temperature,the bending resistance and thermal conductivity of the A357-SiC_(p)/A357 layered composites exhibit a trend of significantly increase at first and then slowly decrease owing to casting defects,interface bonding,and SiCp distribution.Compared with SiCp/A357 composites,the bending strength,deflection,and thermal conductivity of the A357-SiCp/A357 layered composites increase from 257 MPa,1.07 mm,and 155.72 W·(m·K)^(-1) to 298 MPa,2.1 mm,and 169.86 W·(m·K)^(-1),respectively.This study provides a reference for improving the rheological casting of aluminum matrix layered composites.

关 键 词：SEMI-SOLID vacuum stirring suction casting SiCp/A357 layered composites thermodynamic properties rheological casting 

分 类 号：TG146.21[一般工业技术—材料科学与工程]