(1. 蘭州理工大學(xué) 省部共建有色金屬先進(jìn)加工與再利用國家重點(diǎn)實(shí)驗(yàn)室，蘭州 730050；
2. 蘭州理工大學(xué) 有色金屬合金省部共建教育部重點(diǎn)實(shí)驗(yàn)室，蘭州 730050)
摘 要: 采用液-固軋制復(fù)合技術(shù)制備A356/6082層狀復(fù)合板，研究澆注溫度對A356/6082復(fù)合板界面組織及力學(xué)性能的影響。結(jié)果表明：當(dāng)澆注溫度偏高時，界面區(qū)激冷作用強(qiáng)烈，細(xì)小的共晶硅在界面處堆積，阻礙元素進(jìn)一步擴(kuò)散；當(dāng)澆注溫度偏低時，兩種合金僅僅在軋制力作用下形成機(jī)械結(jié)合，其顯微硬度值在界面附近發(fā)生突變，由82.4 HV驟降至61.5 HV；當(dāng)澆注溫度為660 ℃時，復(fù)合板界面區(qū)組織均勻，元素擴(kuò)散寬度約為93 μm，實(shí)現(xiàn)了良好的冶金結(jié)合，其剪切強(qiáng)度最高可達(dá)到114.2 MPa；隨著澆注溫度的降低，復(fù)合板抗拉強(qiáng)度逐漸提高；當(dāng)澆注溫度為620 ℃時，其抗拉強(qiáng)度最大為205 MPa，斷裂位置首先發(fā)生在A356鋁合金一側(cè)。
關(guān)鍵字: 液-固軋制；澆注溫度；復(fù)合板；界面組織；力學(xué)性能
（1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China）
Abstract:A356/6082 laminated bimetal was fabricated by liquid-solid rolling composite technique. The effects of pouring temperature on interfacial microstructure and mechanical properties of A356/6082 bimetal were studied. The results indicate that when the pouring temperature is too high, the fine eutectic silicon accumulates at the interface owing to the strong chilling effect in the interface region, hindering the further diffusion of elements. When the pouring temperature is low, only a mechanical bond forms under rolling force in the transition region between the A356 aluminum alloy and 6082 aluminum alloy. In addition, the micro-hardness value of the transition region suddenly changes from 82.4 HV to 61.5 HV. When the pouring temperature is 660 ℃, the interfacial region of bimetal achieve the good metallurgical bond. The width of element diffusion is about 96 μm and the microstructure is uniform. Moreover, the interfacial shear strength of A356/6082 bimetal can reach up to 114.2 MPa. With the decrease of pouring temperature, the ultimate tensile strength of bimetal gradually increases. When the pouring temperature is 620 ℃, the ultimate tensile strength reaches up to 205 MPa, the fracture location occurs firstly in the side of A356aluminum alloy.
Key words: liquid-solid rolling; pouring temperature; bimetal; interface structure; mechanical properties
