等通道转角挤压工艺对5083铝合金超声空蚀行为的影响

Effect of equal channel angular pressing process on ultrasonic cavitation corrosion behavior of 5083 aluminum alloy

对5083铝合金进行等通道转角挤压(ECAP)加工,利用超声空蚀设备对ECAP加工前后的5083铝合金试样进行超声空蚀实验,研究了ECAP加工对5083铝合金空蚀行为的影响.结果表明:经ECAP加工后,5083铝合金的平均晶粒尺寸明显减小,硬度也有一定的提升;抗空蚀系数由1.651 h/mm增至2.087 h/mm,提升了约26%,空蚀累计最大质量损失由64.2 mg下降至50.8 mg.结合最大空蚀坑深度和平均空蚀坑深度变化可知,ECAP使5083铝合金发生了加工硬化和强化,以及晶粒细化和第二相弥散分布,从而提升了材料的抗空蚀能力.

The ultrasonic cavitation experiments have been conducted on 5083 aluminum alloy samples before and after equal channel angular pressing(ECAP)to study the effect of ECAP on the cavitation behavior of 5083 aluminum alloy.It shows that after ECAP,the average grain size of 5083 aluminum alloy is significantly reduced,and the hardness increases accordingly.After ECAP,the cavitation resistance coefficient of 5083 aluminum alloy increases from 1.651 h/mm to 2.087 h/mm,and the cavitation resistance coefficient increases by about 26%.Besides,the cumulative maximum mass loss of cavitation decreases from 64.2 mg to 50.8 mg.According to the maximum cavitation pit depth and the average cavitation pit depth change,work hardening and strengthening occurs owing to the ECAP process,which leads the grain refinement and second phase dispersion distribution,thus improving the anti cavitation ability of the material.