难熔钨合金因其特有的优良性能被广泛用于航空航天和国防的关键领域，而熔点高和扩散慢使得这类材料的制备通常需要在高温下长时间烧结，从而产生晶粒异常长大和难以完全致密化等问题，限制了其性能提升。我们最近的研究结果显示采用新型振荡压力烧结技术可以显著提高难熔合金的密度、降低烧结温度、抑制晶粒生长和提升材料性能。基于此，本项目将对振荡压力烧结制备W-Ni-Fe难熔合金(90W-7Ni-3Fe)的科学问题展开研究，通过实验与模拟相结合的方法，系统研究振荡压力烧结工艺对材料密度、微观结构（晶粒尺寸、晶界结构、位错）和性能的影响，深入理解振荡压力烧结机理和晶粒生长动力学，建立烧结工艺与微观结构及性能间的关系，明确振荡压力烧结工艺控制机理，为优化烧结工艺、获得高性能难熔材料提供技术支持和理论依据。

The unique properties of refractory tungsten alloys make them very promising for widespread applications, including aerospace, defense, as well as commercial systems. However, due to their high melting points and low diffusion rate, the materials usually required to be sintered at high temperatures and long time, which led to abnormal grain growth and uncompleted densification. Recently, we prepare refractory alloys using the recently developed oscillatory pressure sintering (OPS) technology. Our preliminary results showed that OPS can significantly improve the density, decrease sintering temperature, suppress grain growth, and improve the property. In this project, we will systemically study the effect of processing parameters on the density, microstructure (i.e. grain size, grain boundary structure and dislocations), and properties of resultant materials (90W-7Ni-3Fe) by combining experimental and modeling methods. With these studies, we will be able to obtain the better understandings of the mechanisms and kinetics of the densification and grain growth and to establish processing-structure-property relationships. Then the controlling mechanism of oscillating pressure sintering process will be clarified.The relationships will provide scientific foundation and technical guidelines for optimizing processing to obtain high-performance refractory alloys.