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Title: The yield strength anomaly of single-slip-oriented Fe-Al single crystals

Abstract

Many features of the well-documented yield strength anomaly in B2-structured Fe-Al alloys have been successfully described or predicted by the vacancy-hardening model (George EP, Baker I. Philos Mag 1998;A77: 737). Interestingly, the model does not predict any orientation dependence for the yield anomaly. Here, we examine this by measuring the yield stress of three different single-slip-oriented Fe-43Al single crystals as a function of temperature. It was found that the critical resolved shear stress of all the alloys decreased rapidly with temperature from 77 K to {approx}300 K, showed a plateau from 300 K to 723 K, increased to a peak at 873 K, and then decreased again with further increase in temperature. While neither the low-temperature strength (<300 K) nor the temperature of the yield stress peak depended on the orientation (in agreement with the vacancy-hardening model), the yield stress in the plateau region around room temperature did.

Authors:
 [1];  [1];  [2];  [3]
  1. Dartmouth College
  2. University of New South Wales
  3. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931581
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Intermetallics; Journal Volume: 15; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALLOYS; MONOCRYSTALS; ORIENTATION; SHEAR; YIELD STRENGTH

Citation Formats

Wu, D., Baker, I., Munroe, P R, and George, Easo P. The yield strength anomaly of single-slip-oriented Fe-Al single crystals. United States: N. p., 2007. Web. doi:10.1016/j.intermet.2006.03.007.
Wu, D., Baker, I., Munroe, P R, & George, Easo P. The yield strength anomaly of single-slip-oriented Fe-Al single crystals. United States. doi:10.1016/j.intermet.2006.03.007.
Wu, D., Baker, I., Munroe, P R, and George, Easo P. Mon . "The yield strength anomaly of single-slip-oriented Fe-Al single crystals". United States. doi:10.1016/j.intermet.2006.03.007.
@article{osti_931581,
title = {The yield strength anomaly of single-slip-oriented Fe-Al single crystals},
author = {Wu, D. and Baker, I. and Munroe, P R and George, Easo P},
abstractNote = {Many features of the well-documented yield strength anomaly in B2-structured Fe-Al alloys have been successfully described or predicted by the vacancy-hardening model (George EP, Baker I. Philos Mag 1998;A77: 737). Interestingly, the model does not predict any orientation dependence for the yield anomaly. Here, we examine this by measuring the yield stress of three different single-slip-oriented Fe-43Al single crystals as a function of temperature. It was found that the critical resolved shear stress of all the alloys decreased rapidly with temperature from 77 K to {approx}300 K, showed a plateau from 300 K to 723 K, increased to a peak at 873 K, and then decreased again with further increase in temperature. While neither the low-temperature strength (<300 K) nor the temperature of the yield stress peak depended on the orientation (in agreement with the vacancy-hardening model), the yield stress in the plateau region around room temperature did.},
doi = {10.1016/j.intermet.2006.03.007},
journal = {Intermetallics},
number = 2,
volume = 15,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}