Application of High Pressure Gas Jet Mill Process to Fabricate High Performance Harmonic Structure Designed Pure Titanium
Application of High Pressure Gas Jet Mill Process to Fabricate High Performance Harmonic Structure Designed Pure Titanium
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DOI：
10.2320/matertrans.m2014280
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发表时间：
2015
影响因子：
1.2
通讯作者：
M. Ota;S. Vajpai;Ryota Imao;Kazuaki Kurokawa;K. Ameyama
中科院分区：
文献类型：
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作者：
M. Ota;S. Vajpai;Ryota Imao;Kazuaki Kurokawa;K. Ameyama
多年来，传统的材料发展一直强调微观结构的细化和均匀性。然而，由于变形早期的塑性不稳定性，“纳米和均匀”的微观结构通常不能满足强度和韧性的要求。与这种“纳米和同质“微结构设计相反，我们提出了“和谐结构”设计。谐波结构具有由双峰晶粒尺寸以及受控和特定的细晶粒和粗晶粒拓扑分布组成的异质微观结构。换句话说，谐波结构在微观上是异质的，但在宏观上是同质的。在目前的工作中，谐波结构设计已被应用到纯钛通过一种新的粉末冶金路线组成的控制严重的塑性变形的细粒度的粉末颗粒通过气流粉碎和随后的固结SPS。在宏观尺度上，谐波结构材料表现出显着更好的组合的强度和延性，在准静态拉伸载荷下，相比，其均匀的微观结构的同行。[doi：10.2320/matertrans.M2014280]
Through many years, conventional material developments have emphasized on microstructural refinement and homogeneity. However, “Nanoand Homogeneous” microstructures do not, usually, satisfy the need to be both strong and ductile, due to the plastic instability in the early stage of the deformation. As opposed to such a “nanoand homo-”microstructure design, we have proposed “Harmonic Structure” design. The harmonic structure has a heterogeneous microstructure consisting of bimodal grain size together with a controlled and specific topological distribution of fine and coarse grains. In other words, the harmonic structure is heterogeneous on microbut homogeneous on macro-scales. In the present work, the harmonic structure design has been applied to pure-Ti via a novel powder metallurgy route consisting of controlled severe plastic deformation of the fine-sized powder particles via jet milling and subsequent consolidation by SPS. At a macro-scale, the harmonic structure materials exhibited significantly better combination of strength and ductility, under quasi-static tensile loadings, as compared to their homogeneous microstructure counterparts. [doi:10.2320/matertrans.M2014280]