Cavitation was examined in an Al–Mg solid-solution alloy deformed in tension at 400 °C under conditions providing solute-drag creep, which can produce tensile ductilities from 100% to over 300%. Two nondestructive evaluation techniques were employed to measure the extent of cavitation: ultra-high-resolution x-ray computed tomography and pulse-echo ultrasonic evaluation. Subsequent to nondestructive evaluation, the sample was sectioned for examination by standard metallographic techniques. Metallographic examination confirmed that both nondestructive techniques accurately indicated the extent of cavitation. Ultrasonic testing provided a practical means of distinguishing material with cavities from that without cavities. Ultrahigh- resolution x-ray computed tomography provided an accurate three-dimensional image of internal cavitation.
在溶质拖拽蠕变条件下,铝镁固溶合金在 400 °C 的拉伸变形过程中发生了气穴现象,这种蠕变可产生 100% 到 300% 以上的拉伸延展性。采用了两种无损评估技术来测量空化程度:超高分辨率 X 射线计算机断层扫描和脉冲回波超声波评估。在进行无损评估后,对样品进行了切片,以便用标准金相技术进行检查。金相检测证实,这两种无损检测技术都能准确显示空化的程度。超声波测试为区分有空洞和无空洞的材料提供了一种实用方法。超高分辨率 X 射线计算机断层扫描提供了内部气穴的精确三维图像。