钕对颗粒增强钛基复合材料组织和性能的影响

采用真空自耗电极电弧熔炼制成钕氧化物颗粒增强钛基复合材料.分析了不同Nd含量的钕氧化物颗粒增强钛基复合材料的组织.测试了复合材料棒材的拉伸、热稳定性、持久和蠕变等力学性能.结果表明,Nd元素的加入能够明显地细化铸锭的低倍组织和β热处理棒材的显微组织.随着加入的Nd含量增加,钕氧化物颗粒尺寸增大,其体积分数也明显增多.Nd元素的加入对复合材料的力学性能有利,尤其是高温性能.

Effect of Neodymium on Structure and Properties of Particulate Reinforced Titanium Matrix Composites

The neodymide particulate reinforced titanium matrix composites were made by vacuum arc remelting. The structures of the neodymide particulate reinforced titanium matrix composites with variant Nd content were analyzed by optical microscopy. The mechanical properties of bars,such as tension, thermal stability, creep rupture and creep, were tested. The results show that the addition of neodymium can markedly fine the macrostructures of ingots and microstructures of bars after beta heat treatment. With increasing Nd content, the size and volume fraction of the neodymide particulates increase. Addition of Nd is of advantage for mechanical properties of the composites, especially for properties at high temperature.