气雾化和喷射成形制备大尺寸La62Al15.7(Cu,Ni)22.3非晶合金

利用气雾化和喷射成形技术制备了大尺寸La62Al15.7(Cu,Ni)22.3非晶合金.X射线衍射(XRD)实验证实,直径为340 mm,最大厚度为13 mm的沉积坯具有完全非晶态结构.分析了气雾化和喷射成形La62AIl5.7(Cu,Ni)22.3合金过程中非晶相形成的机制,选定了喷射成形La62Al15.7(Cu,Ni)22.3非晶合金沉积坯致密化的合适的工艺参数.研究结果显示,喷射成形可望成为大尺寸块体(尤其是盘状)非晶合金新的制备技术.

PREPARATION OF MELT-ATOMIZED AND SPRAY-DEPOSITED LA62AL15.7(CU0.5NI0.5)22.3 AMORPHOUS ALLOY

It is known as very difficult to prepare bulk amorphous alloys with much larger size, because the heat release will be hindered and crystallization takes place when the bulk grows larger. In view of existing the bottleneck, a full La62Al15.7(Cu0.5Ni0.5)22.3 amorphous alloy with a diameter of 340 mm and maximum thickness of 13 mm was produced by melt atomization and spray deposition. The formation mechanism of amorphous phase during the process was analyzed. The experimental results have shown that there always exist some porosity in the spray-deposited La62Al15.7(Cu0.5Ni0.5)22.3 amorphous alloy. The micropores in the La62Al15.7(Cu0.5Ni0.5)22.3 amorphous alloy can be eliminated by hot pressing in the undercooled liquid region of the amorphous alloy. The present results have indicated that spray deposition is a potential technique to prepare bulk amorphous alloys with larger size, especially for bigger plate-shaped deposit.