Effects of severe plastic deformation on the microstructures, mechanical properties, and corrosion behavior of U-5.5Nb alloy

被引：7
作者：
Liu, Fan [1 ]
Chen, XiangLin [1 ]
Zhao, YaWen [1 ]
Wang, WenYuan [1 ]
Zou, DongLi [1 ]
Li, RuiWen [1 ]
Xiong, XueFeng [1 ]
Su, Bin [1 ]
机构：
[1] China Acad Engn Phys, Inst Mat, POB 9071, Jiangyou 621907, Peoples R China
来源：
JOURNAL OF NUCLEAR MATERIALS | 2021年 / 557卷
基金：
中国国家自然科学基金;
关键词：
Uranium-niobium alloy; Equal-channel angular pressing; Mechanical machining; Grain refinement; Nanoindentation; Electrochemical corrosion; U-NB ALLOY; TEXTURE DEVELOPMENT; NIOBIUM; URANIUM; PHASE;
D O I：
10.1016/j.jnucmat.2021.153274
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Equal-channel angular pressing (ECAP) and mechanical machining were employed to introduce large plas-tic shear strain into bulk and the surface layer of a U-5.5wt.%Nb (U-5.5Nb) alloy, respectively. Applying ECAP, the U-5.5Nb alloy exhibited a single yield feature on the stress-strain curve in comparison to the "double yield" feature in the water quenched (WQ) counterpart. The difference is attributed to the charac-teristics of severe plastic deformation (SPD) structures obtained by ECAP. Mechanical machining resulted in a further severe microstructure refinement of the SPD surface layer with nano-grains/subgrains, which is accompanied with a dramatic increase of both the hardness and the elastic modulus of the surface layer. It is further proposed that the suppression of the shape memory effect (SME) in the nanostruc-tured U-5.5Nb alloy may be responsible for the enhanced elastic modulus. The results of corrosion rate and pitting susceptibility showed a microstructure dependency, where the ECAP sample exhibited a bet -ter pitting resistance than that of the WQ counterpart. (c) 2021 Elsevier B.V. All rights reserved.
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页数：10
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