当前位置: X-MOL 学术J. Mater. Process. Tech. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The role of vacuum degree in the bonding of Al/Mg bimetal prepared by a compound casting process
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2019-03-01 , DOI: 10.1016/j.jmatprotec.2018.10.010
Guangyu Li , Wenchao Yang , Wenming Jiang , Feng Guan , Haixiao Jiang , Yao Wu , Zitian Fan

Abstract Lost foam casting (LFC) solid-liquid compound process has been regarded as an attractive method for preparing the Al/Mg bimetal, and the vacuum degree is an extremely important factor during the LFC process. In this work, the effects of the vacuum degree on the interfacial microstructures, mechanical properties as well as fracture behavior of the Al/Mg bimetal were systematically studied. The results show that the vacuum degree had a significant effect on the defect fraction and interface layer fraction of the Al/Mg bimetal, while the phase compositions of the interface layer were almost invariant. The defect fraction initially reduced with increasing vacuum degree and then increased when the vacuum degree exceeded 0.03 MPa, and the change rule of the interface layer fraction was opposite to that of the defect fraction. The phase distribution in the interface layer was heterogeneous, and the interface layer was divided into three regions: Al12Mg17+δ(Mg) eutectic, Al12Mg17+Mg2Si and Al3Mg2+Mg2Si. The microhardnesses of the interface layers of the Al/Mg bimetal obtained with different vacuum degrees were much higher than those of the Mg and Al matrixes. An optimal bonding was obtained with a vacuum degree of 0.03 MPa. The fracture of the Al/Mg bimetal mainly occurred in the junction zone of the Al12Mg17+Mg2Si region and the Al3Mg2+Mg2Si region, exhibiting a brittle fracture mode.

中文翻译:

真空度在复合铸造工艺制备的铝/镁双金属键合中的作用

摘要 消失模铸造(LFC)固液复合工艺被认为是制备铝镁双金属的一种有吸引力的方法,真空度是LFC工艺中极其重要的因素。本文系统地研究了真空度对Al/Mg双金属界面微观结构、力学性能和断裂行为的影响。结果表明,真空度对Al/Mg双金属的缺陷分数和界面层分数有显着影响,而界面层的相组成几乎不变。缺陷率随着真空度的增加先降低,当真空度超过0.03 MPa时增加,界面层率的变化规律与缺陷率的变化规律相反。界面层相分布不均匀,界面层分为三个区域:Al12Mg17+δ(Mg)共晶、Al12Mg17+Mg2Si和Al3Mg2+Mg2Si。不同真空度获得的Al/Mg双金属界面层的显微硬度远高于Mg和Al基体的显微硬度。在真空度为 0.03 MPa 时获得最佳结合。Al/Mg双金属的断裂主要发生在Al12Mg17+Mg2Si区和Al3Mg2+Mg2Si区的结合区,呈现脆性断裂模式。不同真空度获得的Al/Mg双金属界面层的显微硬度远高于Mg和Al基体的显微硬度。在 0.03 MPa 的真空度下获得最佳结合。Al/Mg双金属的断裂主要发生在Al12Mg17+Mg2Si区和Al3Mg2+Mg2Si区的结合区,呈现脆性断裂模式。不同真空度获得的Al/Mg双金属界面层的显微硬度远高于Mg和Al基体的显微硬度。在 0.03 MPa 的真空度下获得最佳结合。Al/Mg双金属的断裂主要发生在Al12Mg17+Mg2Si区和Al3Mg2+Mg2Si区的结合区,呈现脆性断裂模式。
更新日期:2019-03-01
down
wechat
bug