skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Deformation twinning in ordered alloys transformation induced ductility in intermetallics. [TiNi; NiAl]

Abstract

Intermetallics, which are ordered alloys, have excellent high temperature strength. Unfortunately a universal problem facing intermetallics is the lack of ductility. This program attempted to look at some novel solutions for enhancing ductility in intermetallics. Deformation twinning has been demonstrated in TiNi to be responsible for its ductility. This was a surprising result since twinning was not believed to occur readily in ordered alloys. Furthermore the twinning occurred on a (114) plane which had not been previously observed. Research into determining the mechanisms for twinning in ordered alloy and understanding how twinning enhances the ductility of intermetallic was studied. Martensitic transformations in many intermetallics also provides a possible means of enhancing ductility. The detwinning of martensite twins or transformation induced martensite provides a mechanism for accommodating large strains. It is known that a metastable martensitic phase may be created by quenching a non-stoichiometric NiAl alloy. This presents the potential of substantial ductility in NiAl. Investigation of the martensitic phase transformation and its effect on the ductility of NiAl alloys was investigated.

Authors:
Publication Date:
Research Org.:
University of Southern California, Los Angeles, CA (United States). Dept. of Materials Science and Engineering
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7082526
Report Number(s):
DOE/ER/45346-T1
ON: DE93002879
DOE Contract Number:  
FG03-88ER45346
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; DUCTILITY; TWINNING; INTERMETALLIC COMPOUNDS; RESEARCH PROGRAMS; NICKEL ALLOYS; TITANIUM ALLOYS; DEFORMATION; PROGRESS REPORT; ALLOYS; DOCUMENT TYPES; MECHANICAL PROPERTIES; TENSILE PROPERTIES; 360102* - Metals & Alloys- Structure & Phase Studies; 360103 - Metals & Alloys- Mechanical Properties

Citation Formats

Goo, E. Deformation twinning in ordered alloys transformation induced ductility in intermetallics. [TiNi; NiAl]. United States: N. p., 1992. Web. doi:10.2172/7082526.
Goo, E. Deformation twinning in ordered alloys transformation induced ductility in intermetallics. [TiNi; NiAl]. United States. doi:10.2172/7082526.
Goo, E. Tue . "Deformation twinning in ordered alloys transformation induced ductility in intermetallics. [TiNi; NiAl]". United States. doi:10.2172/7082526. https://www.osti.gov/servlets/purl/7082526.
@article{osti_7082526,
title = {Deformation twinning in ordered alloys transformation induced ductility in intermetallics. [TiNi; NiAl]},
author = {Goo, E},
abstractNote = {Intermetallics, which are ordered alloys, have excellent high temperature strength. Unfortunately a universal problem facing intermetallics is the lack of ductility. This program attempted to look at some novel solutions for enhancing ductility in intermetallics. Deformation twinning has been demonstrated in TiNi to be responsible for its ductility. This was a surprising result since twinning was not believed to occur readily in ordered alloys. Furthermore the twinning occurred on a (114) plane which had not been previously observed. Research into determining the mechanisms for twinning in ordered alloy and understanding how twinning enhances the ductility of intermetallic was studied. Martensitic transformations in many intermetallics also provides a possible means of enhancing ductility. The detwinning of martensite twins or transformation induced martensite provides a mechanism for accommodating large strains. It is known that a metastable martensitic phase may be created by quenching a non-stoichiometric NiAl alloy. This presents the potential of substantial ductility in NiAl. Investigation of the martensitic phase transformation and its effect on the ductility of NiAl alloys was investigated.},
doi = {10.2172/7082526},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {9}
}