Effects of magnesium and copper additions on tensile properties of Al-Si-Cr die casting alloy under as-cast and T5 conditions

作     者：Hong-yi Zhan Yi-wu Xu Pan Wang Jian-feng Wang Jin-ping Li Le-peng Zhang Hong-yi Zhan;Yi-wu Xu;Pan Wang;Jian-feng Wang;Jin-ping Li;Le-peng Zhang

作者机构：General Motors Global Research&DevelopmentChina Science LaboratoryShanghai 201206China School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China General Motors(China)Investment Co.Ltd.Shanghai 201206China China International Intellectech Corporation(CIIC)Beijing 100004China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2023年第20卷第1期

页      面：12-22页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Central South University  CSU 

主　　题：Al-Si alloy intermetallics high pressure die casting tensile property T7 heat treatment 

摘      要：Aluminum high pressure die casting(HPDC)technology has evolved in the past decades,enabling stronger and larger one-piece casting with significant part *** also offers a higher design freedom for more mass-efficient thin-walled body *** body structures that require excellent ductility and fracture toughness to be joined with steel sheet via self-piercing riveting(for instance,shock towers and hinge pillars,etc.),a costly T7 heat treatment comprising a solution heat treatment at elevated temperatures(450℃-500℃)followed by an over-ageing heat treatment is needed to optimize microstructure for meeting product *** enable cost-efficient mass production of HPDC body structures,it is important to eliminate the expensive T7 heat treatment without sacrificing mechanical *** die cast alloy chemistry is a potential solution to improve fracture toughness and ductility of the HPDC *** present study intends to tailor the Mg and Cu additions for a new Al-Si-Cr type die casting alloy(registered as A379 with The Aluminum Association,USA)to achieve the desired tensile properties without using T7 heat *** was found that Cu addition should be avoided,as it is not effective in enhancing strength while degrades tensile *** addition is very effective in improving strength and has minor impact on tensile *** investigated Al-Si-Cr alloy with a nominal composition of Al-8.5wt.%Si-0.3wt.%Cr-0.2wt.%Fe shows comparable tensile properties with the T7 treated AlSi10MnMg alloy which is currently used for manufacturing shock towers and hinge pillars.