锻压技术

Al-Mg-Ti轧制复合板界面结合机理及力学性能

英文标题：Bonding mechanism and mechanical properties of rolled multilayered composite sheet Al-Mg-Ti

作者：江莉刘辉

分类号：TG335.8

出版年,卷(期):页码：2017,42(2):150-155

摘要：

采用加热轧制复合的方法制备了6061/AZ31/Ti-6Al-4V/AZ31/6061复合板，利用扫描电镜（SEM）、能谱分析仪（EDS）、X射线衍射分析（XRD）和拉伸试验机等分析技术对复合板两种界面的结合机理、力学性能及断裂特征进行了分析。试验结果表明：当轧制压下量大于或等于40%时，由于变形的深入，Ti-6Al-4V层会出现颈缩或断裂;当轧制温度为420 ℃ 时，6061/AZ31界面会出现金属间化合物Al3Mg2，且有这种金属间化合物生成的区域，界面拉剪试验过程中会发生断裂，界面的力学性能降低;当轧制温度为380 ℃、压下量为30%时，Al-Mg-Ti轧制复合板界面结合强度综合性能最优，Al-Mg和Mg-Ti两种界面的失效基本发生在界面原子相互扩散的区域，且不同温度下轧制得到的复合板在拉剪过程中均表现为脆性断裂。

The composite sheet 6061/AZ31/Ti-6Al-4V/AZ31/6061 was produced by hot roll-bonding process, and the bonding mechanism, mechanical properties and fracture characteristics were analyzed by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and tensile machine. The results show that when the total deformation reaches 40% or more, neck or fracture occurs at the layer Ti-6Al-4V because of further deformation, and when the rolling temperature reaches 420 ℃, the intermetallic compound of Al3Mg2 occur at the interfacial zone 6061/AZ31 resulting in fraction during the tensile-shear test, and the bonding strength of composite sheet will be decreased. However, the composite sheet Al-Mg-Ti with excellent comprehensive strength is obtained with rolling temperature 380 ℃ and reduction 30%. The fracture of interfacial zone Al-Mg and Mg-Ti occurs at the diffusion region of interfacial atoms, which shows brittle fracture characteristics for multilayered composite sheets rolled at different temperatares in the process of tensile shearing.

基金项目：

新疆维吾尔自治区高校科研计划（XJEDU2014S074）

江莉（1979-），女，硕士，讲师

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