铸造技术2026，Vol.47Issue(3)：323-331,9.DOI:10.16410/j.issn1000-8365.2026.5235
新型Al-12Si-3.5Cu-0.4Mg铸造铝合金组织、室温力学性能及干摩擦性能研究
Research on the Microstructure,Room Temperature Mechanical Properties,and Dry Friction Performance of a Novel Al-12Si-3.5Cu-0.4Mg Cast Aluminium Alloy
李晓明 1徐涛 1王立志 1程林凯 1张丰华1
作者信息
- 1. 中国航空工业集团公司西安航空计算技术研究所,陕西西安 710065
- 折叠
摘要
Abstract
Al-Si-based alloys are commonly used for lightweight material design in the automotive industry.To meet the lightweight application requirements of fixed rotor parts of hydraulic retarders for heavy-duty vehicles,a novel Al-12Si-3.5Cu-0.4Mg cast aluminium alloy was selected as the research object.The T6 heat treatment process of the experimental alloys and its effect on the dry friction performance were investigated.The microstructure of the as-cast experimental alloy is mainly composed of a primary α-Al phase,eutectic Si phase,and Al2Cu phase.After solution treatment,the eutectic Si phase is spheroidized,and the Al2Cu phase dissolves into the matrix.After aging treatment,a large amount of the nanosizedθ' phase is dispersed and precipitates in the matrix.The T6 heat treatment process for the as-cast experimental alloy was as follows:solution at 470℃ for 12 h and water cooling,followed by aging at 180℃ for 10 h and air cooling.After T6 heat treatment,the room temperature mechanical properties of the as-cast experimental alloy significantly improved,with the ultimate tensile strength and hardness increasing from 221 MPa and 92 HV in the as-cast state to 322 MPa and 144 HV,respectively.Moreover,the T6 heat treatment significantly improves the dry friction performance of the as-cast experimental alloy.The main reason is the high hardness of the T6 state experimental alloy,which makes it difficult for the abrasive particles generated by wear to press into the matrix and produce more oxides.关键词
Al-Si-Cu-Mg铸造铝合金/T6热处理/微观组织/室温力学性能/干摩擦性能Key words
Al-Si-Cu-Mg cast aluminium alloy/T6 heat treatment/microstructure/room temperature mechanical properties/dry friction performance分类
矿业与冶金引用本文复制引用
李晓明,徐涛,王立志,程林凯,张丰华..新型Al-12Si-3.5Cu-0.4Mg铸造铝合金组织、室温力学性能及干摩擦性能研究[J].铸造技术,2026,47(3):323-331,9.
