(哈尔滨理工大学材料科学与工程系， 哈尔滨 150080)
摘 要: 由于LC4 和LY12等铝合金时效处理后硬度与低频WJF-38型微机式金属材质自动分选仪的显示值之间成单值倒“C”型关系，并且过时效件和欠时效件出现在倒"C"型关系的上下两端，所以用低频WJF-38仪能定量检测铝合金的硬度，并直接显示其布氏、 洛氏、 维氏硬度值， 而且能准确分辨其热处理状态、时效程度及进行混料分选 等。其硬度检测精度可达HRB±1.3左右, 分选速度可达1500件／h.
关键字: 铝合金 时效 硬度 低频 无损检测
（Department of Materials Science and Engineering,Harbin University of Science and Engineering, Harbin 150080, P. R. China）
Abstract:The overaging parts and the underaging parts appear at the top and the bottom of the "C" shape relationship curve, respectively, and there is a single-valued reverse "C" shape relationship between the hardness of aluminium alloys such as LC4 and LY12 after aging treatment and the displayed value of the low frequency WJF- 38 type micro-computer based automatic quality of material separator for metal, therefore the low frequency WJF-38 instrument was used to quantitatively test hardness of the aluminium alloys whose Brinell hardness, Rockwell hardness and Vickers hardness can be directly displayed in digits. The instrument can be used to accurately distinguish the heat-reatment state, aging degree and separate the mixed materials. The hardness testing precision can be about HRB±1.3. The separating speed can be1500 parts per hour.
Key words: aluminium alloy aging hardness low frequency nondestructive testing
