【摘要】 采用超声波无损检测探伤试验、断口检测和低倍组织观察等方法判定了7050铝合金预拉伸板中氧化膜缺陷分布情况，并结合金相法和扫描电子显微镜分析了氧化膜缺陷的种类和来源。结果表明，采用水浸法探伤和断口检测可以清晰且高效识别、定位氧化膜缺陷；从断口组织可以看出，试验所用板材中氧化膜缺陷主要表现为淡金色、平台状；结合SEM和能谱分析结果确定，氧化膜缺陷主要为熔炼及铸造过程中熔体表面的氧化物所致。更多还原

【Abstract】 The distribution of oxide film defects in 7050 aluminum alloy pre-stretched plate was identified and determined through ultrasonic nondestructive testing, fracture surface examination, and macrostructure analysis. The types and sources of the oxide film defects were further investigated using metallographic microscopy and scanning electron microscopy(SEM). The results indicate that the immersion testing method and fracture surface examination clearly and efficiently identify and locate oxide film defects. The fracture morphology reveals that the oxide film defects in the tested plates are primarily light golden and platform-shaped. Combined with SEM and energy-dispersive spectroscopy(EDS) analysis, it is concluded that these oxide film defects originate from oxides on the melt surface during the melting and casting processes.更多还原