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Densification Mechanism and Microstructure Evolution of Ti‐48Al‐2Cr‐8Nb Alloy by Spark Plasma Sintering
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2019-09-18 , DOI: 10.1002/crat.201900107 Haoxuan Sun 1 , Zhenhua Wang 1 , Yulei Du 1 , Juntang Yuan 1
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2019-09-18 , DOI: 10.1002/crat.201900107 Haoxuan Sun 1 , Zhenhua Wang 1 , Yulei Du 1 , Juntang Yuan 1
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In this work, Ti‐48Al‐2Cr‐8Nb alloy is sintered via spark plasma sintering with pre‐alloyed powders prepared by the atomized method. The densification mechanism and microstructure evolution of the spark plasma sintered Ti‐48Al‐2Cr‐8Nb alloy are analyzed. The sintering process is divided into two stages of densification and microstructure transformation. First, the densification mechanism of the powder materials at different sintering temperatures is investigated. At the beginning of the sintering process, the powder particles are closely rearranged under pressure. In the middle of the sintering process, the plastic deformation of the powder particles and the material migration between the adjacent particles promote the densification into the high‐speed stage. In the late stages of sintering, the unique equilibrium phase transition of the TiAl alloy allows the densification to be completed quickly. Additionally, the formation process and phase transition mechanism of the near gamma structure, the duplex structure, the full‐lamellar structure, and spherical structure in Ti‐48Al‐2Cr‐8Nb alloy are systematically studied.
中文翻译：
等离子烧结Ti-48Al-2Cr-8Nb合金的致密化机理及组织演变
在这项工作中，Ti-48Al-2Cr-8Nb合金是通过火花等离子烧结与通过雾化方法制备的预合金粉末进行烧结的。分析了火花等离子体烧结Ti-48Al-2Cr-8Nb合金的致密化机理和组织演变。烧结过程分为致密化和微观结构转变两个阶段。首先，研究了粉末材料在不同烧结温度下的致密化机理。在烧结过程开始时，粉末颗粒在压力下紧密排列。在烧结过程的中间，粉末颗粒的塑性变形和相邻颗粒之间的材料迁移促进了致密化进入高速阶段。在烧结的后期，TiAl合金独特的平衡相变使致密化得以快速完成。此外，系统地研究了Ti-48Al-2Cr-8Nb合金中近伽马结构，双相结构，全层状结构和球形结构的形成过程和相变机理。
更新日期：2019-09-18
中文翻译：
等离子烧结Ti-48Al-2Cr-8Nb合金的致密化机理及组织演变
在这项工作中，Ti-48Al-2Cr-8Nb合金是通过火花等离子烧结与通过雾化方法制备的预合金粉末进行烧结的。分析了火花等离子体烧结Ti-48Al-2Cr-8Nb合金的致密化机理和组织演变。烧结过程分为致密化和微观结构转变两个阶段。首先，研究了粉末材料在不同烧结温度下的致密化机理。在烧结过程开始时，粉末颗粒在压力下紧密排列。在烧结过程的中间，粉末颗粒的塑性变形和相邻颗粒之间的材料迁移促进了致密化进入高速阶段。在烧结的后期，TiAl合金独特的平衡相变使致密化得以快速完成。此外，系统地研究了Ti-48Al-2Cr-8Nb合金中近伽马结构，双相结构，全层状结构和球形结构的形成过程和相变机理。
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