The apparent yield strength anomaly in the B2 YCu intermetallic compound is shown not to be a yield point anomaly at all, but rather a phenomenon resulting from the work hardening behavior in YCu, which was found to rise with rising temperature and to drop with increases in strain rate. This effect is shown to occur over temperature ranges where YCu has negative strain rate sensitivity, result in dynamic strain ageing behavior, and the effect is shown to be irreversible when the testing temperature is changed. Neutron diffraction experiments utilizing SMARTS and HIPPO show the evolution of texture and the change in plastic deformation behavior as the temperature is raised.
|Advisor:||Gschneidner, Karl A., Russell, Alan M.|
|Commitee:||Anderson, Iver E., Bastawros, Ashraf, Chumbley, Scott|
|School:||Iowa State University|
|Department:||Materials Science and Engineering|
|School Location:||United States -- Iowa|
|Source:||DAI-B 72/03, Dissertation Abstracts International|
|Keywords:||Flow stress, Strain aging, Strain rate sensitivity, Yield strength, Yttrium copper|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
supplemental files is subject to the ProQuest Terms and Conditions of use.