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采用电化学阴极渗氢、慢应变速率拉伸试验(SSRT)、定氢仪和扫描电子显微镜(SEM)研究了不同时效状态7050铝合金的氢致开裂行为,并应用自由电子理论计算了氢对铝合金晶界上原子结合力的影响。结果表明:氢在铝合金晶界上发生了偏聚,氢的偏聚增大了晶胞点阵常数,降低了晶界原子的平均结合能和原子间的结合力,从而使合金氢脆敏感性(IHE)增加。时效程度对7050铝合金的IHE有很大的影响。在同一充氢条件下,欠时效状态下的铝合金氢含量最大,氢脆效应也最明显,过时效氢含量最低,氢脆效应最弱,峰时效居中。
The hydrogen induced cracking behavior of 7050 aluminum alloy under different aging conditions was investigated by electrochemical cathodic hydrogen permeation, slow strain rate tensile test (SSRT), hydrogen deposition and scanning electron microscopy (SEM). The free electron theory was used to calculate the hydrogen Effect of Atomic Bonding on the Grain Boundary of Aluminum Alloy. The results show that hydrogen segregates at the grain boundary of aluminum alloy and the segregation of hydrogen increases the lattice constant of the unit cell and decreases the average binding energy and the binding force between the atoms in the grain boundary so as to make the alloy susceptible to hydrogen embrittlement Sexual (IHE) increase. The degree of aging on the 7050 aluminum IHE has a great impact. Under the same hydrogen-charging condition, the hydrogen content of the aluminum alloy under the aging condition is the largest, the hydrogen embrittlement effect is the most obvious, the hydrogen content is the lowest, the hydrogen embrittlement effect is the weakest, and the peak aging is in the middle.