(哈爾濱理工大學(xué)材料科學(xué)與工程系， 哈爾濱 150080)
摘 要: 由于LC4 和LY12等鋁合金時效處理后硬度與低頻WJF-38型微機(jī)式金屬材質(zhì)自動分選儀的顯示值之間成單值倒“C”型關(guān)系，并且過時效件和欠時效件出現(xiàn)在倒"C"型關(guān)系的上下兩端，所以用低頻WJF-38儀能定量檢測鋁合金的硬度，并直接顯示其布氏、 洛氏、 維氏硬度值， 而且能準(zhǔn)確分辨其熱處理狀態(tài)、時效程度及進(jìn)行混料分選 等。其硬度檢測精度可達(dá)HRB±1.3左右, 分選速度可達(dá)1500件／h.
關(guān)鍵字: 鋁合金 時效 硬度 低頻 無損檢測
（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
