【摘要】 采用双丝电弧增材制造（WAAM）的方法制备了Ti-48Al合金,在此基础上通过原位合金化方法制备了Ti-48Al-2Cr-2Nb金属间化合物,借助XRD、OM、SEM、微小力学拉伸以及高温氧化试验表征了2种合金的组织与性能。结果表明,2种堆积试样成分均匀,并且均由γ-TiAl和α₂-Ti₃Al片层组织组成,微量合金元素Cr和Nb的添加不改变合金的相组成。微小力学拉伸结果证实了Cr和Nb微量元素的添加可以显著提高合金的抗拉强度,但对塑性没有明显的影响。高温抗氧化性试验结果表明,Ti-48Al-2Cr-2Nb合金试样比Ti-48Al合金具有更优良的抗氧化性能,试样的最终增重由5.26 mg/cm²降低至1.95 mg/cm²。更多还原

【Abstract】 Ti-48Al and Ti-48Al-2Cr-2Nb alloys were fabricated by in-situ alloying assisted double-wire arc additive manufacturing（WAAM）.The microstructures and properties of the two alloys were characterized by XRD, OM, SEM, micro mechanical tensile test and high temperature oxidation test.The results indicate that both of the two deposited alloys show quite uniform components and they are composed of γ-TiAl and α₂-Ti₃Al.The additions of trace Cr and Nb show no significant effect on microstructure.Micro tensile testing shows that ultimate strength elevates after the addition of Cr and Nb, while it exerts no significant effect to plasticity.High temperature oxidation resistance test confirms that Ti-48Al-2Cr-2Nb has a good resistance to oxidation compared to Ti-48Al.The final mass gain of the Ti-48Al-2Cr-2Nb sample decreases from 5.26 mg/cm² to 1.95 mg/cm².更多还原