亓鹏,李伯龙,王同波,周廉,聂祚仁.挤压铸造工艺对Al-7Si-0.4Mg-0.3Er汽车左支架组织与性能影响[J].稀有金属材料与工程,2020,49(4):1360~1365.[Qi Peng,Bolong Li,Tongbo Wang,Lian Zhou,Zuoren Nie.Effect of squeeze casting process on the microstructure and properties of Al-7Si-0.4Mg-0.3Er alloy bracket for the entransport of automotive engine[J].Rare Metal Materials and Engineering,2020,49(4):1360~1365.]
挤压铸造工艺对Al-7Si-0.4Mg-0.3Er汽车左支架组织与性能影响
投稿时间:2019-01-15  修订日期:2019-03-08
中文关键词:  挤压铸造  Al-7Si-0.4Mg-0.3Er  汽车发动机左支架  浇注温度  挤压速度
基金项目:国家自然科学基金创新研究群体项目(51621003);科技创新服务能力建设-科研基地-北京实验室-现代交通金属材料与加工技术北京实验室北京实验室(参与)(市级)
中文摘要:
      利用OM、SEM微观组织分析以及显微硬度测试研究了挤压铸造成形工艺对Al-7Si-0.4Mg-0.3Er铝合金汽车发动机左支架显微组织和性能的影响。研究结果表明:凝固顺序对铸件不同部位微观组织影响较大,较先凝固左支架薄壁区初生α-Al组织相较于后凝固厚壁区细小。低温浇注成形相较于高温浇注制备左支架初生α-Al更为细小且均匀分布,但低温浇注支架晶间Er-π-AlFeMgSi 相粗大且偏聚分布。高挤压速度相较于低速制备左支架晶间Er-π-AlFeMgSi 相更为均匀细小。低温650℃高速成形铸件热处理后显微硬度为119HV,标准偏差为5HV,相较于低温低速制备左支架14HV性能分布均匀。铝合金发动机支架适于在低温浇铸高速挤压铸造成形。
Effect of squeeze casting process on the microstructure and properties of Al-7Si-0.4Mg-0.3Er alloy bracket for the entransport of automotive engine
英文关键词:Squeeze casting  Al-7Si-0.4Mg-0.3Er  bracket for the entransport of automotive engine  pouring temperature  extrusion speed
英文摘要:
      An investigation was carried out to study the effect of squeeze casting process on the microstructure and properties of Al-7Si-0.4Mg-0.3Er alloy by OM, SEM and microhardness. The results show that the solidification sequence has great influence on the microstructure of different parts of bracket, the size of primary α-Al grains in the thick parts is smaller than the thin parts. The primary α-Al phase and Er-π-AlFeMgSi phase in bracket is smaller and more uniform distribution, which is fabricated by lower temperature of 650℃ and higher speed 2. The microhardness is 119HV and standard deviation is 5HV after heat treatment, the properties is more uniform distribution than the bracket fabricated by low temperature and high speed. Al-Si alloy engine bracket is suitable for low temperature pouring and high speed forming.
作者单位E-mail
亓鹏 北京工业大学 qipeng@emails.bjut.edu.cn 
李伯龙 北京工业大学 blli@bjut.edu.cn 
王同波 北京工业大学 wtb@emails.bjut.edu.cn 
周廉 北京工业大学, 西北有色金属研究院 zhoul@c-nin.com 
聂祚仁 北京工业大学 zrnie@bjut.edu.cn 
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