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冷却方式对散热用Al-Si-Mg合金组织与性能的影响
Effect of Cooling Conditions on Microstructures and Properties of Al-Si-Mg Alloys for Heat Dissipation
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- DOI:
- 作者:
- 范卫忠 闫俊 黄鹏宇 王亚婧 蔡云龙 朱慧颖 翁文凭 长海博文
FAN Weizhong;YAN Jun;HUANG Pengyu;WANG Yajing;CAI Yunlong;ZHU Huiying;WENG Wenping;Hiromi Nagaumi
- 作者单位:
- 华劲新材料研究院（广州）有限公司 苏州大学沙钢钢铁学院
Huajin New Material Research Institute(GUANZHOU)Co.,Ltd.,Guangzhou 510000,China;School of Iron and Steel,Soochow University,Suzhou 215000,China
- 关键词:
- AL-SI-MG合金 冷却强度 显微组织 热导率
Al-Si-Mg alloys cooling rate microstructures thermal conductivity
- 摘要:
- 采用不同铸造冷却方式(水冷铜模、风冷、空冷)制备了Al-9Si-0.3Mg合金试样,研究了不同冷却条件下Al-9Si-0.3Mg合金组织结构及传热性能的影响规律。结果表明,冷却方式对Al-9Si-0.3Mg合金强度与热导率影响显著,随着冷却强度提高,初生α-Al逐渐趋向均匀,共晶Si逐渐变得细小圆整,合金屈服强度、伸长率会显著提高,而热导率小幅下降;当冷却强度较低时,强化元素在Al基体中固溶数量减少,更多以析出第二相的方式存在,对提高材料热导率有利。当采用冷却强度居中的风冷方式时,其屈服强度为126.0 MPa,伸长率为4.2%,热导率为141.9 W/m·K,综合性能良好。
Al-9 Si-0.3 Mg alloy were prepared by different casting cooling methods(such as water-cooled copper mold,forced-cooling,air-cooling),and the effect of different cooling conditions on the microstructure and heat transfer performance of Al-9 Si-0.3 Mg alloy was studied.The results show that the cooling mode has a significant effect on the strength and thermal conductivity of Al-9 Si-0.3 Mg alloy.With the increase of cooling strength,the primaryα-Al gradually becomes uniform,and eutectic Si gradually becomes fine and round.The yield strength and elongation of Al-9 Si-0.3 Mg alloy increase significantly,while the thermal conductivity decreases slightly.When the cooling strength is low,the amount of solid solution of reinforcing elements in Al matrix decreases,and more of them exist in the form of precipitation of the second phase,which is beneficial to improve the thermal conductivity of materials.The yield strength,elongation and thermal conductivity are 126.0 MPa,4.2%and 141.9 W/m·K,respectively,when the forced-cooling mode with medium cooling strength is adopted.