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.
出处
《锻压技术》
CAS
CSCD
北大核心
2017年第2期150-155,共6页
Forging & Stamping Technology
基金
新疆维吾尔自治区高校科研计划(XJEDU2014S074)
关键词
金属层状复合材料
复合轧制
Al-Mg-Ti复合板
界面结合强度
断裂
metal multilayered composite
composite rolling
Al-Mg-Ti composite sheet
bonding strength of interfacial zone
fracture
