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

Journal Article · · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
 [1];  [2]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Univ. of Texas, Austin, TX (United States)
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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.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1575275
Report Number(s):
SAND-2018-12686J; 672099
Journal Information:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 50, Issue 10; ISSN 1073-5623
Publisher:
ASM InternationalCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

References (28)

Relative effect(s) of texture and grain size on magnetic properties in a low silicon non-grain oriented electrical steel journal August 2003
A Review of Strain Analysis Using Electron Backscatter Diffraction journal March 2011
Mechanical behavior of crystalline solids at elevated temperature journal January 1968
Growth of preexisting abnormal grains in molybdenum under static and dynamic conditions journal April 2017
Flow stress, subgrain size, and subgrain stability at elevated temperature journal June 1977
The evolution of dislocation density during heat treatment and creep of tempered martensite ferritic steels journal September 2003
The structure of high-angle grain boundaries journal November 1966
Strain Induced Abnormal Grain Growth in Nickel Base Superalloys journal March 2013
Dynamic abnormal grain growth in tantalum journal July 2014
The Effects of Grain Size and Texture on Dynamic Abnormal Grain Growth in Mo journal July 2016
Dynamic Abnormal Grain Growth in Refractory Metals journal August 2015
The Initiation and Propagation of Dynamic Abnormal Grain Growth in Molybdenum journal October 2015
Creep and dislocation substructure journal January 1985
Dynamic Abnormal Grain Growth in Molybdenum journal July 2013
Power-law creep of powder-metallurgy grade molybdenum sheet journal August 2007
Recrystallization and the Development of Abnormally Large Grains After Small Strain Deformation in a Polycrystalline Nickel-Based Superalloy journal January 2016
Grain Boundary Migration in Metals book January 2009
Five-power-law creep in single phase metals and alloys journal January 2000
Grain Growth in Thin Films journal August 1990
The surface energy of metals journal August 1998
Dynamic abnormal grain growth: A new method to produce single crystals journal November 2009
A self-consistent anisotropic approach for the simulation of plastic deformation and texture development of polycrystals: Application to zirconium alloys journal September 1993
Anomalous Fatigue Behavior and Fatigue-Induced Grain Growth in Nanocrystalline Nickel Alloys journal May 2011
Abnormal grain growth and grain boundary faceting in a model Ni-base superalloy journal July 2000
The relative rates of secondary and normal grain growth journal April 1987
The effect of initial grain size distribution on abnormal grain growth in single-phase materials journal September 1998
The distribution of rotation axes in a random aggregate of cubic crystals journal February 1964
On the High-Temperature Creep Behaviour and Substructures in Alpha-Iron Single Crystals journal January 1972

Figures / Tables (15)

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