过程参数对双束熔体原位复合法制备的Cu-TiB_2合金组织结构的影响

Effect of Procedure Parameters on Microstructure of Cu-TiB_2 Alloys Prepared by in-Situ Reaction of Double-Beam Melts

利用双束熔体原位复合法制备了Cu-TiB2弥散强化铜合金,研究了不同原位复合条件、送气压力以及中间合金浓度对其组织结构的影响。结果表明:在较大送气压力下利用扁形喷嘴原位复合制备的合金组织更加优越;增大冷却速度使固液界面捕捉TiB2粒子能力增强,有利于避免TiB2粒子团聚;但随TiB2粒子浓度增加,粒子团聚趋势增强,并相应提出了避免TiB2粒子团聚的解决途径。

TiB2 dispersion strengthened copper alloys were prepared by in-situ reaction of double-beam melts, and the effect of in-situ reaction conditions, plenum pressure and solute element concentration of master alloys on the microstructure of Cu-TiB2 alloys were investigated. The results show that the microstructures of Cu-TiB2 alloys prepared by using the higher plenum pressure and flat nozzles are superior and that the ability of solid liquid interface to catching TiB2 particles is improved as the increase of cooling velocity, which is favorable to avoid the aggregation of TiB2 particles. However, with the increase of TiB2 particle concentration, the aggregation tendency of particles is also increased. And several solution ways to avoid the aggregation of TiB2 particles were introduced in this paper.