Microstructural characteristics of cold-rolled Zr-2.5Nb alloy annealed near the monotectoid temperature
Microstructural characteristics of cold-rolled Zr-2.5Nb alloy annealed near the monotectoid temperature
复制标题
冷轧Zr-2.5Nb合金在偏析温度附近退火的显微组织特征
DOI：
10.1007/s11431-017-9130-4
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发表时间：
2018-04-01
影响因子：
4.6
通讯作者：
Huang, XiaoYu
中科院分区：
文献类型：
--
作者：
Chai, LinJiang;Wu, Hao;Huang, XiaoYu
A dual-phase Zr-2.5Nb alloy was rolled at room temperature to 50% reduction and then annealed at two temperatures (560 and 580A degrees C) near the monotectoid temperature. X-ray diffraction, electron channeling contrast imaging and electron backscatter diffraction techniques were jointly used to characterize microstructural characteristics developed in the as-rolled and annealed specimens. Results show that plastic deformation occurs in both bulk alpha-Zr grains and thin beta-Zr films during rolling, allowing large lattice strains to be accumulated in beta-Zr and active dislocation slip (especially the prismatic aOE (c) a > slip) to be initiated in alpha-Zr. During subsequent annealing at 580A degrees C, the prior beta-Zr films are transformed into submicron beta-Zr particles, which lose coherency (the Burgers orientation relationship) with surrounding alpha grains. In the specimen annealed at 560A degrees C, however, the prior beta-Zr films are found to be decomposed into nanoscale beta-Nb particles. In both the annealed specimens, the beta-Zr and the beta-Nb particles appeared to be linearly distributed along the rolling direction. Two types of alpha structures, i.e., small equiaxed crystallites formed by recovery of dislocation structures and coarse bamboo-like recrystallized grains, are revealed in the annealed specimens. Effective boundary pinning due to the dense beta-phase particles is demonstrated to play a key role in forming such unusual bamboo-like grains.
