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This content will become publicly available on April 11, 2019

Title: Probing the Effect of Hydrogen on Elastic Properties and Plastic Deformation in Nickel Using Nanoindentation and Ultrasonic Methods

Hydrogen effects on small-volume plasticity and elastic stiffness constants are investigated with nanoindentation of Ni-201 and sonic velocity measurements of bulk Ni single crystals. Elastic modulus of Ni-201, calculated from indentation data, decreases ~22% after hydrogen charging. This substantial decrease is independently confirmed by sonic velocity measurements of Ni single crystals; c 44 decreases ~20% after hydrogen exposure. Furthermore, clear hydrogen-deformation interactions are observed. The maximum shear stress required to nucleate dislocations in hydrogen-charged Ni-201 is markedly lower than in as-annealed material, driven by hydrogen-reduced shear modulus. Additionally, a larger number of depth excursions are detected prior to general yielding in hydrogen-charged material, suggesting cross-slip restriction. Together, these data reveal direct correlation between hydrogen-affected elastic properties and plastic deformation in Ni alloys.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Southwest Research Inst. (SwRI), San Antonio, TX (United States); Kyushu Univ. (Japan). International Inst. for Carbon-Neutral Energy Research (WPI-I2CNER)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Geomechanics Dept.
  4. Purdue Univ., West Lafayette, IN (United States). School of Materials Engineering
Publication Date:
Report Number(s):
SAND-2018-2771J
Journal ID: ISSN 1047-4838; 661439
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Name: JOM. Journal of the Minerals, Metals & Materials Society; Journal ID: ISSN 1047-4838
Publisher:
Springer
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1432790