摘要
利用金相显微镜、扫描电镜、激光导热仪、数字电导率仪等手段,研究了Si、Fe、Mn、Sr等元素和T2热处理工艺对高导热铝合金组织及性能的影响。结果表明,Si、Fe、Mn含量的增加对铝合金的热导率和电导率起消极作用,这是由于这些元素添加后形成板片状的共晶Si、长针状β-Fe相、片状Al-Mn相阻碍了以电子为主导的能量传递。Si元素的固溶会导致热导率和电导率降低,采用T2热处理可以降低晶格畸变的不利影响,提高合金的热导率。Sr可以有效地细化共晶Si相,当Sr含量为0.03%时,热导率达到最高,为200.7 W/(m·K),电导率为26.53 MS/m。Al-6Si-0.8Fe-0.0075Sr合金应用于散热盘压铸件,其铸态的热导率达到173.43 W/(m·K),T2热处理后达到212.86 W/(m·K)。
The effects of Si, Fe, Mn, Sr and T2 heat treatment on the microstructure and properties of high thermal conductivity aluminum alloy were investigated by metallographic microscope, scanning electron microscope, laser thermal conductivity meter and digital conductivity meter. The results indicate that the increase of Si, Fe and Mn contents has a negative effect on the thermal conductivity and electric conductivity of aluminum alloy, since the lamellar eutectic silicon, the long needle-like β-Fe phase and the lamellar Al-Mn phase hindering energy transfer dominated by electron. The solution of Si leads to the decrease of thermal conductivity and electric conductivity, while T2 heat treatment can reduce the adverse effect of lattice distortion and improve the thermal conductivity of the alloy. The eutectic silicon phase can be effectively refined by Sr. When the content of Sr is 0.03%, thermal conductivity of the aluminum alloy reaches the maximum of 200.7 W/(m·K) and the conductivity is 26.53 MS/m. The Al-6 Si-0.8 Fe-0.0075 Sr alloy was applied to heat sink die castings, where the as-cast thermal conductivity reaches over 173.43 W/(m·K), and up to 212.86 W/(m·K) after T2 heat treatment.
作者
陈森煜
王火生
傅淑云
曹智强
Chen Senyu;Wang Huosheng;Fu Shuyun;Cao Zhiqiang(School of Materials Science and Engineering,Fujian University of Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2022年第6期749-754,共6页
Special Casting & Nonferrous Alloys
基金
福建省科技计划资助项目(2020H0022)
关键词
高导热铝合金
导热性能
导电性能
High Thermal Conductivity Aluminum Alloy
Thermal Conductivity
Electrical Conductivity
作者简介
第一作者:陈森煜,男,1995年出生,硕士研究生,福州(350118),E-mail:354700043@qq.com;通信作者:王火生,男,1978年出生,副教授,福州(350118),E-mail:hkyg@163.com
