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Enhanced stress relaxation behavior via basal $$\langle a \rangle$$ dislocation activity in Zircaloy-4 cladding

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [3];  [3];  [4]
  1. Univ. of California, Berkeley, CA (United States); Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  2. Univ. of California, Berkeley, CA (United States); NRCN, Beer-Sheva (Israel)
  3. Idaho National Laboratory (INL), Idaho Falls, ID (United States)
  4. Univ. of California, Berkeley, CA (United States)

Herein this work evaluates the stress relaxation behavior of textured Zircaloy-4 cladding to understand how mechanical anisotropy influences pellet-cladding interactions. Uniaxial and biaxial stress relaxation tests are performed using full-tube axial tension and internal pressurization, respectively, aiming to achieve 0.25%, 1%, and 2% equivalent strains in the cladding samples at a temperature of 300°C. Internal pressure relaxation test results display enhanced stress relaxation compared to axial testing results, particularly for samples loaded beyond yield. Results of electron backscatter diffraction indicate increased deformation microstructure during loading and increased strain homogenization and recovery during relaxation for samples loaded via internal pressurization. Analysis indicates that the increased production and activity of basal $$\langle a \rangle$$ dislocations play a significant role in the enhanced relaxation measured in samples subjected to internal pressurization.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
2439507
Alternate ID(s):
OSTI ID: 2429471
OSTI ID: 2588467
OSTI ID: 2583946
Report Number(s):
INL/MIS--24-78591-Rev000; INL/JOU--24-77309
Journal Information:
Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 601; ISSN 0022-3115
Publisher:
Elsevier BVCopyright Statement
Country of Publication:
United States
Language:
English

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