材料科学
放电等离子烧结
微观结构
复合材料
钛粉
晶体孪晶
钛
分离式霍普金森压力棒
芯(光纤)
动态再结晶
绝热剪切带
粒度
再结晶(地质)
纹理(宇宙学)
极限抗拉强度
应变率
冶金
烧结
热加工
计算机科学
人工智能
古生物学
图像(数学)
生物
作者
G. Dirras,Masaki Ota,David Tingaud,Kei Ameyama,Tatsuya Sekiguchi
出处
期刊:Matériaux et techniques
[EDP Sciences]
日期:2015-01-01
卷期号:103 (3): 311-311
被引量:10
标识
DOI:10.1051/mattech/2015031
摘要
Commercially pure α-titanium powder was subjected to mechanical milling, after which each powder particle exhibited a core-shell-like structure consisting of coarse and fine grains, respectively. Subsequently, spark plasma sintering was used to consolidate the severe plastically deformed powder. Bulk samples made of a 3D network of continuously connected shells, hereafter referred to as harmonic structure, were obtained. The dynamic response of the processed samples was tested using a direct impact Hopkinson pressure bars (DIHPB) at initial strain rate of 15 500 s-1 corresponding to a velocity of 50 m.s-1, and at fixed axial strains of 20, 50 and 90%. For the strain of 20%, both compression and tensile twins dominate the coarse-grained core. At the same time, [0001] texture fiber developed in the core, while the grain in the shell rotated toward the axis parallel to the impact direction. At a strain of 50% the grains in the shell rotated further and reinforced the [0001] texture fiber, while in the same time twinning frequency saturated in the core. Increasing the strain to 90% resulted in quasi-disappearance of twins. Tortuous localization bands 25–30 μm wide were observed whose microstructural characteristics suggest dynamic recrystallization as a consequence of adiabatic heating.
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