Microstructural and Texture Evolution in Pure Niobium during Severe Plastic Deformation by Differential Speed Rolling

被引：4
作者：
Park, Sang Yong [1 ]
Kim, Woo Jin [2 ]
机构：
[1] Korea Inst Ind Technol, Adv Fus Proc R&D Grp, Incheon 21999, South Korea
[2] Hongik Univ, Dept Mat Sci & Engn, Seoul 04066, South Korea
来源：
MATERIALS | 2022年 / 15卷 / 03期
基金：
新加坡国家研究基金会;
关键词：
niobium; high ratio differential rolling (HRDSR); continuous dynamic recrystallization (CDRX); texture; severe plastic deformation; DYNAMIC RECRYSTALLIZATION; MECHANICAL-PROPERTIES; COLD;
D O I：
10.3390/ma15030752
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The evolution of the microstructure and texture in body-centered cubic (BCC) niobium (Nb) during conventional rolling and high-ratio differential rolling (HRDSR) at room temperature were compared. More effective grain refinement of the initial microstructure through continuous dynamic recrystallization (CDRX) occurred in the samples processed by HRDSR, but the overall degree of grain refinement was small, despite having undergone severe plastic deformation due to the low rate of CDRX. CDRX more preferentially proceeded on {111} gamma-fiber grains than on {001} alpha-fiber grains. The HRDSR-processed samples exhibited weaker alpha-fiber and stronger gamma-fiber than the conventionally processed samples, which indicates that the high shear deformation induced by HRDSR discourages the development of alpha-fiber while promoting the development of gamma-fiber. The HRDSR processed Nb showed a high tensile strength of 450 MPa, and the major strengthening mechanism for the HRDSR-processed Nb was dislocation-density strengthening at large thickness reductions.
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收藏
页数：13
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