含微量钪和锶元素的铝硅镁合金的力学性能

Mechanical Performances of Al-Si-Mg Alloy with Dilute Sc and Sr Elements.

作者信息

Zhang Zichen, Zhao Qingfeng, Liu Lihua, Xia Xingchuan, Zheng Cheng, Quan Liwei, Ding Jian, Chen Xueguang, Luo Xudong, Wang Lisheng, Song Kaihong, Li Chong, Liu Yongchang

机构信息

School of Material Science and Engineering, Hebei University of Technology, Tianjin 300401, China.

CITIC Dicastal Co., LTD, Qinhuangdao 066011, China.

出版信息

Materials (Basel). 2020 Feb 2;13(3):665. doi: 10.3390/ma13030665.

DOI:10.3390/ma13030665

PMID:32024304

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7040805/

Abstract

Due to its excellent comprehensive performances, Al-Si-Mg alloy i widely used in automotive, transportation and other fields. In this work, tensile performances and fracture behavior of Al-Si-Mg alloy modified by dilute Sc and Sr elements (Al-7.12Si-0.36Mg-0.2Sc-0.005Sr) were investigated at the temperature of -60-200 °C for the first time, aiming to obtain a satisfactory thermal stability within a certain temperature range. The results showed that the new designed Al-Si-Mg alloy possessed a completely stable yield strength and a higher-level elongation under the present conditions. Fracture morphology analysis, fracture profile observation and strengthening mechanism analysis were applied to elucidate the evolution mechanisms of yield strength and elongation of the alloy. The fracture modes were significantly distinct in different temperature sections, and the reasons were discussed. In addition, the interaction among the nano precipitate phase particles, the deformation substructure and the dislocations were responsible for the thermal stability of the alloy within a certain temperature range.

摘要

由于其优异的综合性能，Al-Si-Mg合金广泛应用于汽车、交通运输等领域。在本研究中，首次对经稀Sc和Sr元素改性的Al-Si-Mg合金（Al-7.12Si-0.36Mg-0.2Sc-0.005Sr）在-60至200°C温度范围内的拉伸性能和断裂行为进行了研究，旨在在一定温度范围内获得令人满意的热稳定性。结果表明，新设计的Al-Si-Mg合金在当前条件下具有完全稳定的屈服强度和较高水平的伸长率。通过断口形貌分析、断口剖面观察和强化机制分析来阐明合金屈服强度和伸长率的演变机制。不同温度区间的断裂模式明显不同，并对其原因进行了讨论。此外，纳米析出相粒子、变形亚结构和位错之间的相互作用是合金在一定温度范围内热稳定性的原因。