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Title: Subgrains, Texture Evolution, and Dynamic Abnormal Grain Growth in a Mo Rod Material

Abstract

The roles of subgrains, texture, and surface energy during dynamic abnormal grain growth (DAGG) were examined in a commercial-purity Mo rod material. DAGG was confirmed in this material during tensile deformation at 2023 K (1750 °C). Cooling of specimens after tensile testing was sufficiently rapid to preserve both subgrain structures developed during deformation and several abnormal grains at early stages of growth. These and other microstructural features were characterized to evaluate how subgrains and boundary character influence the early stages of DAGG. Subgrains were observed in the deformed polycrystalline material but were generally absent in newly formed abnormal grains. This was identified as the cause of the sudden drop in flow stress observed at the initiation of DAGG. It is proposed that subgrain intersections with abnormal grain boundaries provide a driving pressure for DAGG. Subgrains within the deformed polycrystals were observed to locally change the boundary curvature at their intersections with abnormal grain boundaries, which likely encouraged growth of the abnormal grains into the deformed polycrystals. Abnormal grains produced by DAGG retained crystallographic orientations and boundary characters that closely resembled those of the polycrystalline material from which they grew. This indicates that neither differences in orientation nor boundary character weremore » important to DAGG in this material.« less

Authors:
 [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
OSTI Identifier:
1575275
Report Number(s):
SAND-2018-12686J
Journal ID: ISSN 1073-5623; 672099
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 50; Journal Issue: 10; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Noell, Philip J., and Taleff, Eric M. Subgrains, Texture Evolution, and Dynamic Abnormal Grain Growth in a Mo Rod Material. United States: N. p., 2019. Web. doi:10.1007/s11661-019-05370-2.
Noell, Philip J., & Taleff, Eric M. Subgrains, Texture Evolution, and Dynamic Abnormal Grain Growth in a Mo Rod Material. United States. doi:10.1007/s11661-019-05370-2.
Noell, Philip J., and Taleff, Eric M. Mon . "Subgrains, Texture Evolution, and Dynamic Abnormal Grain Growth in a Mo Rod Material". United States. doi:10.1007/s11661-019-05370-2.
@article{osti_1575275,
title = {Subgrains, Texture Evolution, and Dynamic Abnormal Grain Growth in a Mo Rod Material},
author = {Noell, Philip J. and Taleff, Eric M.},
abstractNote = {The roles of subgrains, texture, and surface energy during dynamic abnormal grain growth (DAGG) were examined in a commercial-purity Mo rod material. DAGG was confirmed in this material during tensile deformation at 2023 K (1750 °C). Cooling of specimens after tensile testing was sufficiently rapid to preserve both subgrain structures developed during deformation and several abnormal grains at early stages of growth. These and other microstructural features were characterized to evaluate how subgrains and boundary character influence the early stages of DAGG. Subgrains were observed in the deformed polycrystalline material but were generally absent in newly formed abnormal grains. This was identified as the cause of the sudden drop in flow stress observed at the initiation of DAGG. It is proposed that subgrain intersections with abnormal grain boundaries provide a driving pressure for DAGG. Subgrains within the deformed polycrystals were observed to locally change the boundary curvature at their intersections with abnormal grain boundaries, which likely encouraged growth of the abnormal grains into the deformed polycrystals. Abnormal grains produced by DAGG retained crystallographic orientations and boundary characters that closely resembled those of the polycrystalline material from which they grew. This indicates that neither differences in orientation nor boundary character were important to DAGG in this material.},
doi = {10.1007/s11661-019-05370-2},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 10,
volume = 50,
place = {United States},
year = {2019},
month = {7}
}

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