Trace Ca alloying enhance simultaneously strength and ductility of squeeze-cast Al-5Cu-0.5Mn-based alloys

扫码查看

原文链接

NETL
NSTL
万方数据

外文摘要：The strength-ductility inversion relationship of alloys is a persistent challenge in advanced materials de-sign.Al-Cu series cast aluminum alloys that are considered as an exceptionally high-strength light alloy are not exclusive in structural applications due to their inherently poor plasticity.In this work,we em-ployed a squeeze casting technique and Ca microalloying strategy for microstructure modulation to ef-fectively address this difficulty.The addition of low concentrations of Ca(0.5 wt.％and 1 wt.％)elements to the as-cast Al-5Cu-0.5Mn alloy significantly enhances its plasticity by threefold at room temperature.Unexpectedly,even after T6 treatment,which typically compromises ductility for increased strength,the low-Ca micro-alloyed Al-5Cu-0.5Mn exhibited a further increase in its strength without sacrificing its ductility.The low-Ca addition to the alloy generates an ultrafine eutectic colony with a complex"core-shell"structure,which can serve as a carrier for localized stress transfer,effectively distributing the strain uniformly to more grains.Precipitation hardening of α-Al grains and spheroidization of lamellar ultrafine eutectic phases were simultaneously realized in the low-Ca alloy after T6 heat treatment,which resulted in comparable hardness of α-Al grains and eutectic colonies.The synergistic coordination of external strains through extensive strain-hardening induced by slip line and substantial microcrack generation by ultrafine eutectic colonies is evidenced by a series of in situ characterizations of the low-Ca alloys.There-fore,the uniform spreading deformation due to the transfer of strain-hardening effect and the alternating plastic deformation of α-Al grains and ultrafine eutectic colonies are the critical keys to overcoming the strength-plasticity paradox in low-Ca alloys.This study provides a perspective route for Al-Cu system cast aluminum alloys to be utilized as high-strength and tough structural materials.

外文关键词：

Al-Cu-Mn-Ca alloySqueeze castingPlasticity mechanismCracking mechanism

作者：

Zhanwei Su、Zhuoran Zeng、Sai Zhang、Xianming Meng、Shiwei Xu

展开 >

作者单位：

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China

College of Materials Science and Engineering,Hunan University,Changsha,410082,China

China Automotive Technology&Research Center Co.Ltd,Tianjin 300300,China

College of Materials Science and Engineering,Hunan University,Changsha 410082,China

展开 >

基金：

Science and Technology Innovation Leading Talent Project of Hunan Provincethe"Technology Innovation 2025"Major Special Project of Ningbo CityIntegrated Design of Composition-Structure-Forging of Large-Size and High-Loading Magnesium Transmission Casing for Next Gen

项目编号：

2020RC40132020Z033U22A200616

出版年：

2024

DOI：

10.1016/j.jmst.2023.11.075

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.191(24)