摘要
采用抗拉强度、导电率性能测试和X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)等分析方法研究双级形变时效对Al-B电工圆杆组织和性能的影响。结果表明:经双级形变时效处理后,合金的导电率和抗拉强度随预时效温度的升高呈先升后降趋势,且预变形量越小,材料的抗拉强度峰值出现越缓慢,预变形量过大时材料的导电率和抗拉强度指标下降;析出相与基体保持共格关系,呈弥散分布,在STEM模式下结合傅里叶交换(FFT)衍射花样可确定为强化相θ’相。通过预变形32%+预时效110℃×2 h+终变形83%+终时效190℃×6 h处理,合金的抗拉强度达到181 MPa,导电率为58. 5%IACS,延伸率为8%,与单级形变时效(变形量83%+时效190℃×6 h)对比,其导电率和抗拉强度都有较大提升,综合性能较佳。
The effects of two-stage deformation aging on the microstructure and properties of Al-B electric round rods were studied by means of hardness,conductivity test and X-ray diffraction (XRD),scanning electron microscopy (SEM)and transmission electron mi- croscopy (TEM).The results showed that the electrical conductivity and tensile strength of the alloy firstly increased and then decreased with the increase of the pre-aging temperature after the aging treatment of two-stage deformation.When the pre-deformation was small,the peak value of the tensile strength of the alloy appeared more slowly,while the predeformation was too large,the conductivi- ty of the material and tensile strength index decreased.The precipitates dispersedly distributed in the matrix and remained in a coherent relationship with them.In the scan-TEM (S-TEM)mode,the diffraction pattern could be determined as the enhanced phase θ'.Compared with the alloy with single-stage deformation aging process (deformation amount of 83%+aging of 190℃×6h),through the 32%pre-deformation +110℃×2h pre-aging +83%final deformation +190℃×6h final aging process,the alloy obtained tensile strength value of 181MPa,conductivity of 58.5%IACS,elongation of 8%,the conductivity and tensile strength were greatly im- proved,and the overall performance was better.
作者
鄢俊
雷源源
张晓燕
林廷艺
胡谢君
张俊杰
Yan Jun;Lei Yuanyuan;Zhang Xiaoyan;Lin Tingyi;Hu Xiejun;Zhang Junjie(College of Material and Metallurgy,Guizhou University,Guiyang 550025,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2018年第11期1221-1226,共6页
Chinese Journal of Rare Metals
基金
贵州省科学技术厅(黔科合LH字[2017]7243号)
贵州大学2017年度学术新苗培养及创新探索专项(黔科合平台人才[2017]5788)资助
关键词
铝电工圆杆
双级形变时效
抗拉强度
导电率
electrical round aluminum rod
two stage deformation aging process
tensile strength
electrical conductivity
