Al_3Ti及其L1_2型变异合金的制备

Fabrication of L1_2-Al_3Ti Intermetallics by Mechanical Alloying and Annealing

以Al、Ti、X（X=Cr、Mn、Fe、Co、Ni、Cu等）高纯度粉末为原料，以高能球磨机和真空热处理炉为设备，将原料按Al3Ti或Al3Ti—X合金化学计量比配合，添加少量过程控制剂，适当控制转速、球料比，磨球直径等球磨工艺参数，在氩气保护下球磨30h后，在真空热处理炉中经过600～800℃低温热处理，成功制备出了Al3Ti及其L12型变异合金。该方法制备的合金纯度可达95％以上，而且简单易行，经济高效。可望实现Al3Ti合金的工业化生产。

Different pure elemental powders with stoichiometric proportion of Al75Ti25 or Al67Ti25X8 （X = Cr, Mn, Fe, Co, Ni, Cu, etc.） were chosen to fabricate Al3Ti or L12 - Al3Ti compounds. All blends of elemental powders were mechanically milled using a high energy planetary mill for 30 h under the controlled test parameters, such as the rotation speed of 400 r/min and the ball- to- powder weight ratio of 10：1. The powders handling were done with the aid of process controlling agents under argon atmospheres to prevent oxidation. After that, the powders were subjected to the thermal treatment at 600 - 800 ℃ under the protection of argon atmosphere. Al3Ti or L12 - Al3Ti compounds with the purity of 95% were obtained. This technique is expected to realize industrial production, owing to its easy controlling,low cost and high efficiency.