Nie Jinfeng, Liu Mingxing, Wang Fang, Zhao Yonghao, Li Yusheng, Cao Yang, Zhu Yuntian
Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China.
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA.
Materials (Basel). 2016 Nov 23;9(11):951. doi: 10.3390/ma9110951.
Al(1060)/Mg(AZ31)/Al(1060) multilayered composite was successfully produced using an accumulative roll bonding (ARB) process for up to four cycles at an elevated temperature (400 °C). The microstructure evolution of the composites and the bonding characteristics at the interfaces between Al and Mg layers with increasing ARB cycles were characterized through optical microscopy, field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). It was found that the grains of Al and Mg layers were significantly refined and Al₃Mg₂ and Al Mg intermetallic compound layers formed at the Al/Mg bonding interfaces. The strength increased gradually and the ultimate tensile strength (UTS) reached a maximum value of about 240 MPa at the third pass. Furthermore, the strengthening mechanism of the composite was analyzed based on the fracture morphologies.
采用累积轧制复合（ARB）工艺，在400℃的高温下成功制备了Al(1060)/Mg(AZ31)/Al(1060)多层复合材料，累积轧制复合循环次数最高达4次。通过光学显微镜、场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）对复合材料的微观结构演变以及随着ARB循环次数增加Al与Mg层之间界面的结合特性进行了表征。结果发现，Al层和Mg层的晶粒显著细化，并且在Al/Mg结合界面处形成了Al₃Mg₂和Al Mg金属间化合物层。强度逐渐增加，在第三次轧制时极限抗拉强度（UTS）达到最大值，约为240MPa。此外，基于断口形貌分析了复合材料的强化机制。
