摘要
采用Al-5Ti-1B合金细化剂对Al-3.2Si-0.8Mg合金进行晶粒细化,采用金相显微镜、激光导热仪和拉伸试验机等研究晶粒细化对Al-3.2Si-0.8Mg合金微观组织、铸造流动性、力学性能与导热系数的影响.结果表明:随着Al-5Ti-1B合金细化剂添加量的增加,Al-3.2Si-0.8Mg合金的α-Al晶粒逐渐细化,铸造流动性、抗拉强度和伸长率逐渐升高,但导热系数略有下降.当Al-5Ti-1B合金细化剂的质量分数增加到0.5%时,Al-3.2Si-0.8Mg合金的晶粒被细化至平均直径约为90.9μm,铸造流动性试样长度为867 mm,抗拉强度为234 MPa,伸长率为10.1%,导热系数为182.7 W·m^(-1)·K^(-1).
The Al-3.2Si-0.8Mg alloy was refined through adding Al-5Ti-1B alloy refiner.The effects of grain refinement on casting fluidity,thermal conductivity and mechanical properties of Al-3.2Si-0.8Mg alloy were studied by metallurgical microscope,flash thermal conductivity meter and tensile testing machine,respectively.The results show that with the increasing amount of Al-5Ti-1B alloy refiner,the α-Al grains of Al-3.2Si-0.8Mg alloy were more refined.In addition,the casting fluidity,tensile strength and elongation of Al-3.2Si-0.8Mg alloy were improved,and the thermal conductivity was reduced.When the amount of Al-5Ti-1B alloy refiner was 0.5%,the grains size was able to be refined to 90.9 μm for Al-3.2Si-0.8Mg alloy with casting fluidity of length 867 mm,tensile strength of 234 MPa,elongation of 10.1%,and thermal conductivity of 182.7 W·m^-1·K^-1.
出处
《有色金属材料与工程》
CAS
2017年第2期73-77,共5页
Nonferrous Metal Materials and Engineering
基金
广东省科学院科研平台环境与能力建设专项资助项目(2016GDASPT-03
2016GDASPT-0201)