(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: 以6061鋁合金為液態(tài)澆注金屬，以AZ31B鎂合金為固態(tài)基板，采用固-液復(fù)合鑄造法制備了Al/Mg 雙金屬復(fù)合材料。研究了6061鋁合金熔體澆注溫度對(duì)復(fù)合材料界面組織、寬度、相組成和力學(xué)性能的影響。結(jié)果表明：隨著6061鋁合金液澆注溫度的升高，復(fù)合材料界面過渡區(qū)寬度增加，從360 μm增加到1120 μm，且金屬間化合物體積分?jǐn)?shù)增加；當(dāng)6061鋁合金液的澆注溫度在660~700 ℃時(shí)，可獲得良好的6061和AZ31B雙金屬冶金結(jié)合界面；界面附近可分為五個(gè)不同區(qū)域，鋁合金基體區(qū)，鎂合金基體區(qū)，靠近鋁合金側(cè)區(qū)域主要由α(Al)和Al3Mg2相組成，靠近鎂合金側(cè)區(qū)域主要由α-Mg和Mg17Al12相組成，中間過渡區(qū)由Mg17Al12和Al3Mg2相組成，在中間過渡區(qū)中發(fā)現(xiàn)了AlMg4Zn11相，該相可以有效提高復(fù)合材料的結(jié)合性能；當(dāng)6061鋁合金液澆注溫度為680 ℃時(shí)，復(fù)合材料界面強(qiáng)度達(dá)到最大，其中剪切強(qiáng)度為39 MPa，抗拉強(qiáng)度為49.5 MPa。
關(guān)鍵字: 6061鋁合金；AZ31B鎂合金；雙金屬復(fù)合鑄造；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 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
