| Si含量对7050铝合金显微组织和抗应力腐蚀开裂的影响 |
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| 引用本文： | 佘欢,储威,疏达,王俊,孙宝德.Si含量对7050铝合金显微组织和抗应力腐蚀开裂的影响[J].中国有色金属学会会刊,2014,24(7):2307-2313. |
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| 作者姓名： | 佘欢 储威 疏达 王俊 孙宝德 |
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| 作者单位： | 上海交通大学上海市先进高温材料及其精密成形重点实验室;上海交通大学金属基复合材料国家重点实验室; |
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| 基金项目： | Project(2012CB619505)supported by the National Basic Research Program of China;Project(NCET-13-0370)supported by the Program for New Century Excellent Talents in Universities of China |
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| 摘 要： | 分别研究Si含量为0．094％、0．134％和0．261％的3种T7651态7050铝合金的组织和应力腐蚀开裂敏感性。结果表明：随着Si含量从0．094％增加到0．261％，Mg2Si相的面积分数从0．16％增加到1．48％，并且尺寸粗化；而其它粗大相（包括Al2CuMg、Mg（Al3Cu，Zn）2和Al7Cu2Fe）的面积分数从2．42％减小到0．78％。合金的电导率随Si含量的增加而增加。合金在空气中进行慢应变速率拉伸时，抗拉强度和伸长率随Si含量的增加而降低；而在3．5％NaCl溶液中进行慢应变速率拉伸时，随Si含量增加，合金应力腐蚀开裂敏感性降低。
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| 关 键 词： | 7050铝合金 Si含量 显微组织 抗应力腐蚀开裂 |
| 收稿时间： | 17 October 2013 |
Effects of silicon content on microstructure and stress corrosion cracking resistance of 7050 aluminum alloy |
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| Huan SHE,Wei CHU,Da SHU,Jun WANG,Bao-de SUN.Effects of silicon content on microstructure and stress corrosion cracking resistance of 7050 aluminum alloy[J].Transactions of Nonferrous Metals Society of China,2014,24(7):2307-2313. |
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| Authors: | Huan SHE Wei CHU Da SHU Jun WANG Bao-de SUN |
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| Affiliation: | Huan SHE, Wei CHU, Da SHU, Jun WANG, Bao-de SUN( 1. Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China; 2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China) |
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| Abstract: | Evolution of microstructure and stress corrosion cracking （SCC） susceptibility of 7050 aluminum alloy with 0.094%, 0.134% and 0.261% Si （mass fraction） in T7651 condition have been investigated. The results show that the area fraction of Mg2Si increases from 0.16% to 1,48% and the size becomes coarser, while the area fraction of the other coarse phases including Al2CuMg, Mg（Al,Cu,Zn）2 and A17Cu2Fe decreases from 2.42% to 0.78% with Si content increasing from 0.094% to 0.261%. The tensile strength and elongation of 7050-T7651 alloys is decreased with the increase of Si content by slow strain rate test （SSRT） in ambient air. However, electrical conductivity is improved and SCC susceptibility is reduced with the increase of Si content by SSRT in corrosion environment with 3.5% NaCl solution. |
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| Keywords: | 7050 aluminum alloy silicon content microstructure stress corrosion cracking resistance |
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