铸造技术2026，Vol.47Issue(2)：153-161,9.DOI:10.16410/j.issn1000-8365.2026.5125
Cd元素对ZL205A微观组织和拉伸性能的影响
Effect of Cd on the Microstructures and Tensile Properties of ZL205A
摘要
Abstract
Microalloying is an effective and feasible strengthening strategy for Al alloys.However,the influence of Cd,which is the most important trace element of ZL205A,on precipitation hardening is not fully understood.On this basis,the effects of Cd on the microstructure and tensile properties of the ZL205A alloy were systematically investigated.The results show that the microalloying of Cd significantly enhances the strength by～130 MPa.Microstructure analysis indicates that the main precipitate of the T6 ZL205A alloy is the θ"phase,and the addition of Cd element promotes the θ"→ θ'phase transformation,resulting in θ'becoming the dominant precipitate.This makes the alloy precipitation strengthening mechanism change from dislocation shearing through the θ"phase to dislocation bypassing the θ'phase,thereby effectively enhancing the strengthening effect.On the basis of the STEM-EDS characterization,it is suggested that Cd promotes the θ"→ θ'phase transformation through two synergistic mechanisms:① Cd has high vacancy binding energies,leading to the formation of Cd-Cu-vacancy clusters,providing Cu atoms for transformation;② the Cd-vacancy pairs dissociate at the temperature of the θ'phase formation and release vacancies,which increases the diffusion rate of the Cu atoms in the Al matrix,thus promoting the transformation of θ"to θ'.关键词
微合金化/拉伸性能/析出相/ZL205A合金Key words
microalloying/tensile properties/precipitation/ZL205A alloy分类
矿业与冶金引用本文复制引用
张子扬,王锦程,何峰,王松宇,左强,张明申,陈俊,刘林翔,白晓昱,王志军,李俊杰..Cd元素对ZL205A微观组织和拉伸性能的影响[J].铸造技术,2026,47(2):153-161,9.基金项目
国家自然科学基金(52474425) （52474425）
中国科协青年人才托举工程(2023QNRC001) （2023QNRC001）
中央高校基本科研业务费(G2022KY05109,G2024KY0612) （G2022KY05109,G2024KY0612）
凝固技术全国重点实验室(西北工业大学)研究基金(2023-QZ-02) （西北工业大学）
