摘要
通过进行拉伸实验和低周疲劳实验以及利用扫描电子显微镜(SEM)进行观察与分析,研究了Sc对T6态轧制变形Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr合金力学性能的影响。拉伸实验结果表明:Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr-0.2Sc合金的抗拉强度、屈服强度和断裂伸长率均高于Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr合金。低周疲劳实验结果表明:Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr(-0.2Sc)合金在0.4%~0.8%的外加总应变幅加载下均表现为循环稳定;Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr(-0.2Sc)合金的塑性应变幅和弹性应变幅与载荷反向周次之间均呈线性关系,并分别服从Coffin-Manson和Basquin公式;Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr(-0.2Sc)合金的疲劳裂纹均以穿晶方式萌生于疲劳试样的自由表面,并以穿晶方式扩展。
The effect of Sc on the mechanical properties of hot-rolled Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr alloy subjected to the T6 treatment was investigated through performing the tensile test and low-cycle fatigue test.The results of tensile tests show that the ultimate tensile strength,yield strength and elongation of Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr-0.2Sc alloy are higher than those of Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr alloy.The results of low-cycle fatigue tests shows that the Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr(-0.2 Sc)alloys exhibit the cyclic stability at the total strain amplitudes from 0.4%to 0.8%.The plastic strain amplitude and elastic strain amplitude of Al-6.5Zn-2.3Mg-2.0Cu-0.2Ce-0.1Zr(-0.2 Sc)alloys show the linear relationship with the number of reversals to failure,which can be described by the Coffin-Manson equationand Basquin equation,respectively.The fatigue cracks initiate at the free surface of fatigue samples and propagate in a transgranular mode.
作者
左鹏
李锋
王莹
张浩宇
张思倩
陈立佳
Zuo Peng;Li Feng;Wang Ying;Zhang Haoyu;Zhang Siqian;Chen Lijia(School of Materials Sci-ence and Engineering,Shenyang University of Technology,Shenyang 110870,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2019年第6期730-738,I0003,共10页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(51501117)资助
