(1. 哈爾濱理工大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150040；
2. 哈爾濱吉星機械工程有限公司，哈爾濱 150069；
3. 臨沂市科學(xué)技術(shù)合作與應(yīng)用研究院，臨沂 276000)
摘 要: 研究了固溶時間對擠壓鑄造ADC12鋁合金顯微組織及力學(xué)性能的影響。結(jié)果表明：隨著固溶時間的延長，顯微組織中粗大片狀共晶Si和針狀A(yù)l5FeSi相均細化為細小顆粒狀，長寬比(L/B)值由8.9降到2.0；合金的抗拉強度由擠壓鑄態(tài)的227 MPa增加到固溶時間為10 h的274 MPa；維氏硬度呈現(xiàn)先增加后降低的趨勢，在固溶時間為4 h時達到最大值110HV，之后趨于穩(wěn)定。ADC12鋁合金斷裂形式由準解理斷裂向韌性斷裂轉(zhuǎn)變。
關(guān)鍵字: ADC12鋁合金；間接擠壓鑄造；固溶時間；顯微組織；力學(xué)性能
（1. School of Material Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China;
2. Harbin Jixing Mechanical Engineering Company Limited, Harbin 150069, China;
3. Linyi Academy of Technology Cooperation and Application, Linyi 276000, China）
Abstract:The microstructure and mechanical properties of ADC12 aluminum alloy with different solution time were studied. The results show that, with the increase of solution time, the coarse lamellar eutectic Si and the needle like Al5FeSi phase in the squeeze casting microstructure are fine granular, and the ratio of length to width(L/B value) decreases from 8.9 to 2. The tensile strength of the material increases from 227 MPa of the squeeze casting to 274 MPa after 10 h solution treatment; Vickers hardness exhibits reducing after the first increase trend in the solution time to reach maximum 110HV at 4 h, and then trends to stable. The fracture form of ADC12 casting aluminum alloy transforms from quasi cleavage fracture to ductile fracture after solution treatment.
Key words: ADC12 aluminum alloy; indirect squeeze casting; solution time; microstructure; mechanical property
