T6态挤压变形Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc)合金的低周疲劳行为
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- 英文论文题名：LOW-CYCLE FATIGUE BEHAVIOR OF EXTRUDED Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) ALUMINIUM ALLOYS SUBJECTED TO T6 TREATMENT
- 论文作者：朱庆岩 ; 车欣 ; 陈立佳
- 英文论文作者：Zhu Qingyan ; Che Xin ; Chen Lijia ; School of Materials Science and Engineering ; Shenyang University of Technology
- 年：2016
- 作者机构：沈阳工业大学材料科学与工程学院;
- 论文关键词：Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc)铝合金 ; 低周疲劳 ; 疲劳寿命 ; 疲劳断裂
- 英文论文关键词：Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) alloy ; low-cycle fatigue ; fatigue life ; fatigue fracture
- 会议召开时间：2016-07-19
- 会议录名称：第十五届全国金相与显微分析学术年会论文集
- 语种：中文
- 分类号：TG146.21;TG379
- 学会代码：EGTA
- 会议名称：第十五届全国金相与显微分析学术年会
- 会议地点：中国青海西宁
- 主办单位：中国体视学学会金相与显微分析分会
- 学会名称：中国体视学学会
- 页数：5
- 文件大小：1685k
- 原文格式：O
- 会议级别：全国
摘要
通过在不同外加总应变幅下进行轴向总应变控制的室温低周疲劳实验,探讨了稀土元素Sc对T6态挤压变形Al-7Zn-2Mg-1.5Cu-0.1Zr合金的室温低周疲劳行为的影响。结果表明,低周疲劳加载条件下,T6态挤压变形Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc)合金表现为循环硬化和循环稳定;微量Sc的添加可提高T6态挤压变形Al-7Zn-2Mg-1.5Cu-0.1Zr合金的循环变形抗力和低周疲劳寿命;T6态挤压变形Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc)合金的塑性应变幅、弹性应变幅与反向载荷周次之间的关系可分别用Coffin-Manson公式和Basquin公式描述;T6态挤压变形Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc)合金的疲劳裂纹均以穿晶方式萌生于疲劳试样表面,并以穿晶方式扩展。
The influence of Sc addition on the low-cycle fatigue behavior of extruded Al-7Zn-2Mg-1.5Cu-0.1Zr alloy with T6 state was investigated through performing the axial total strain controlled low-cycle fatigue tests at room temperature and different total strain amplitudes.The results indicate that the extruded Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) alloys with T6 state exhibits the cyclic strain hardening and stable cyclic stress response during fatigue deformation.The addition of Sc element can enhance the cyclic defonnation resistance and prolong the low-cycle fatigue lives of Al-7Zn-2Mg-1.5Cu-0.1Zr alloy.The plastic and elastic strain amplitudes of Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) alloys with T6 state as a function of reversals to failure show the linear relationship and obey the Coffin-Manson equation and Basquin equation,respectively.In addition,the fatigue cracks initiate at the free surface of fatigue specimens and propagate in a transgranular mode for the extruded Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) alloys with T6 state.
The influence of Sc addition on the low-cycle fatigue behavior of extruded Al-7Zn-2Mg-1.5Cu-0.1Zr alloy with T6 state was investigated through performing the axial total strain controlled low-cycle fatigue tests at room temperature and different total strain amplitudes.The results indicate that the extruded Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) alloys with T6 state exhibits the cyclic strain hardening and stable cyclic stress response during fatigue deformation.The addition of Sc element can enhance the cyclic defonnation resistance and prolong the low-cycle fatigue lives of Al-7Zn-2Mg-1.5Cu-0.1Zr alloy.The plastic and elastic strain amplitudes of Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) alloys with T6 state as a function of reversals to failure show the linear relationship and obey the Coffin-Manson equation and Basquin equation,respectively.In addition,the fatigue cracks initiate at the free surface of fatigue specimens and propagate in a transgranular mode for the extruded Al-7Zn-2Mg-1.5Cu-0.1Zr(-0.2Sc) alloys with T6 state.
引文
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[3]Prosenjit D,Javaganthan R,Chowdhury T,et al.Fatigue behavior and crack growth rate of cryorolled Al 7075 alloy[J].Materials Science and Engineering A,2011,528(24):7124-7132.
[4]He Y D,Zhang X M,You J H.Effects of minor contents of Sc and Zr on microstructure and mechanical properties of Al-Zn-Mg-Cu alloy[J].Rare Metal Materials and Engineering,2007,36(4):665-670.
[5]Fang H C,Chen K H,Chen X,et al.Effect of Zr,Cr and Pr additions on microstructures and properties of ultra-high strength Al-Zn-Mg-Cu alloys[J].Materials Science and Engineering A,2011,528(25-26):7606-7615.
[6]Duan Y L,Xu G F,Peng X Y,et al.Effect of Sc and Zr additions on grain stability and superplasticity of the simple thermal-mechanical processed Al-Zn-Mg alloy sheet[J].Materials Science and Engineering A,2015,648:80-91.
[7]Li G,Zhao N,Liu T,et al.Effect of Sc/Zr ratio on the microstructure and mechanical properties of new type of Al-Zn-Mg-Sc-Zr alloys[J].Materials Science and Engineering A,2014,617:219-227.
[8]Zhang W,Xing Y,Jia Z H,et al.Effect of minor Sc and Zr addition on microstructure and properties of ultra-high strength aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2014,24(12):3866-3871.