自然时效对Al-Zn-Mg合金型材抗应力腐蚀性能的影响
发布时间：2018-09-04 09:31
【摘要】：采用电导率实验与慢应变速率拉伸实验研究自然时效对Al-Zn-Mg合金型材应力腐蚀断裂的影响,通过扫描电镜、透射电镜等显微组织分析揭示其性能变化的机理。结果表明:Al-Zn-Mg合金型材的电导率随着自然时效时间的延长呈下降趋势,停放至28 d左右基本达到稳定状态,稳定后合金的内、外表层电导率分别为32.20(IACS)%与31.50(IACS)%。自然时效后再进行人工时效((90℃,12 h)+(169℃,11 h)),Al-Zn-Mg合金型材的抗拉强度(R_m)随自然时效时间的延长而显著降低,但合金的抗应力腐蚀性能明显提高;自然时效后,合金内晶界无沉淀析出带变宽(PFZ),晶界析出相尺寸与间距变大。
[Abstract]:The effect of natural aging on stress corrosion cracking of Al-Zn-Mg alloy profile was studied by electrical conductivity test and slow strain rate tensile test. The mechanism of properties change was revealed by SEM and TEM. The results show that the conductivity of the alloy profiles decreases with the prolongation of natural aging time, and reaches a stable state at about 28 days. The conductivity of the outer layer of the alloy is 32.20 (IACS)% and 31.50 (IACS), respectively. After natural aging, the tensile strength (Rm) of artificial aging (90 鈩，
本文编号：2221686
[Abstract]:The effect of natural aging on stress corrosion cracking of Al-Zn-Mg alloy profile was studied by electrical conductivity test and slow strain rate tensile test. The mechanism of properties change was revealed by SEM and TEM. The results show that the conductivity of the alloy profiles decreases with the prolongation of natural aging time, and reaches a stable state at about 28 days. The conductivity of the outer layer of the alloy is 32.20 (IACS)% and 31.50 (IACS), respectively. After natural aging, the tensile strength (Rm) of artificial aging (90 鈩，
本文编号：2221686
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