制备方法对W-10%Ti合金组织性能的影响

以高纯钨粉、钛粉和TA2钛片为原料,分别采用液相烧结法和熔渗法制备了Ti含量为10%的W-Ti合金;测量了W-10%Ti合金的密度和杂质(C、N和O)含量,研究了不同方法制备的W-Ti合金的相组成和微观形貌.结果表明,熔渗法制备的W-Ti合金致密度达94%以上,相结构由含有较多富Ti相的固溶体β(W/Ti)组成;液相烧结的合金致密度为90%左右,组织相对均匀;两种方法制备的合金杂质(C、N和O)含量均较低.探讨了液相烧结制备W-10%Ti合金时固溶体扩散形成的机理.

Effect of preparation methods on microstructure and properties of W-10%Ti alloy

By using high--purity tungsten powders, titanium powders and TA2 Ti sheet as the raw materials, W--10%Ti alloys were prepared by infiltration and liquid--phase sintering respectively. The density and impurity content of C, N and O in W--10%Ti alloy were measured. The morphology, composition and microstructure were characterized. The results show that W--10%Ti alloy prepared by infiltration has a relative density of above 94% and is mainly consisted of Ti--rich $beta$ solid solution, while the relative density of W--Ti prepared by liquid phase sintering is about 90% and the microstructure is uniform. The W--Ti alloys prepared by both methods have low impurity contents. The formation mechanism of W--10%Ti alloy by liquid phase sintering was discussed as well.