论文部分内容阅读
采用扫描电镜下原位拉伸方法,观察研究了电解渗氢后的N18锆合金中氢化物的变形过程和基体的滑移行为,分析了氢化物对拉伸性能的影响。研究发现,锆合金基体的塑性变形是由多滑移引起的,氢化物可随基体发生较大变形。稀疏分布的带状氢化物簇对滑移的阻碍小,滑移线能够穿过而不改变方向,但尺寸较大的氢化物簇会阻碍滑移带的穿过而改变滑移方向。氢化物使抗拉强度略有增加,伸长率显著下降,但氢含量达到623μg/g的N18锆合金的伸长率仍然达到了13.1%,具有较好的塑性。
Hydrides deformation and slipping behavior of N18 zirconium alloy after electroosmosis were investigated by in-situ tensile test under scanning electron microscope. The effects of hydride on tensile properties were analyzed. It is found that the plastic deformation of the zirconium alloy matrix is caused by more slip, and the hydride can be greatly deformed with the matrix. Sparsely distributed bands of hydride clusters have less of a hindrance to slippage, and slip lines can pass through without changing direction, but larger hydride clusters impede the passage of slip bands and change the slip direction. The hydride makes the tensile strength slightly increase and the elongation decreases obviously. However, the elongation of the N18 zirconium alloy with the hydrogen content of 623μg / g still reaches 13.1%, which shows good ductility.