(1. 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室，兰州 730050；
2. 兰州理工大学 有色金属合金省部共建教育部重点实验室，兰州 730050)
摘 要: 以6061铝合金为液态浇注金属，以AZ31B镁合金为固态基板，采用固-液复合铸造法制备了Al/Mg 双金属复合材料。研究了6061铝合金熔体浇注温度对复合材料界面组织、宽度、相组成和力学性能的影响。结果表明：随着6061铝合金液浇注温度的升高，复合材料界面过渡区宽度增加，从360 μm增加到1120 μm，且金属间化合物体积分数增加；当6061铝合金液的浇注温度在660~700 ℃时，可获得良好的6061和AZ31B双金属冶金结合界面；界面附近可分为五个不同区域，铝合金基体区，镁合金基体区，靠近铝合金侧区域主要由α(Al)和Al3Mg2相组成，靠近镁合金侧区域主要由α-Mg和Mg17Al12相组成，中间过渡区由Mg17Al12和Al3Mg2相组成，在中间过渡区中发现了AlMg4Zn11相，该相可以有效提高复合材料的结合性能；当6061铝合金液浇注温度为680 ℃时，复合材料界面强度达到最大，其中剪切强度为39 MPa，抗拉强度为49.5 MPa。
关键字: 6061铝合金；AZ31B镁合金；双金属复合铸造；界面组织；力学性能
（1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China）
Abstract:Using 6061 aluminum alloy as the pouring melt and AZ31B magnesium alloy as the solid substrate, the Al/Mg bimetallic composite was prepared by the solid-liquid compound casting method. The effects of 6061 aluminum alloy melt pouring temperature of on the interface structure, width, phase composition and mechanical properties of the composites were mainly studied. The results show that with the increase of pouring temperature of 6061 aluminum alloy melt, the width of interface transition zone of composite increases from 360 μm increased to 1120 μm. And the volume fraction of intermetallics increases. When the pouring temperature of 6061 aluminum alloy melt ranges from 660 to 700 ℃, a well metallurgical bonding interface of 6061 and AZ31B bimetal can be obtained. The vicinity of the interface can be divided into five different regions. Aluminum alloy matrix area, magnesium alloy matrix area, and the area near the aluminum alloy side are mainly composed of α(Al) and Al3Mg2 phases, and the area near the magnesium alloy side is mainly composed of α-Mg and Mg17Al12 phases, and the intermediate transition zone is composed of Mg17Al12 and Al3Mg2 phases, AlMg4Zn11 phase is found in the intermediate transition zone, which is effective to improve the interface bonding performance of the composite. When the pouring temperature of 6061 aluminum alloy melt is 680 ℃, the interface bonding strength of the composites is up to the maximum, in which the shear strength is 39 MPa and the tensile strength is 49.5 MPa.
Key words: 6061 aluminum alloy; AZ31B magnesium alloy; bimetal compound casting; interface structure; mechanical property
