Mechanical properties of E2{sub 1} (Mn, Fe){sub 3}AlC-base alloys
Mechanical properties of E2{sub 1} (Mn, Fe){sub 3}AlC-base alloys were investigated. The E2{sub 1} crystal structure is closely related to L1{sub 2}, and thereby E2{sub 1} compounds are expected to exhibit superior properties similar to those of the L1{sub 2} Ni{sub 3}Al. Nominal compositions are fixed to be 60mol%(Mn, Fe)-20mol%Al-20mol%C. Alloys were prepared by mechanical alloying and hot pressing. ICP chemical analysis, X-ray diffraction analysis, scanning electron microscopy and electron probe microanalysis were carried out for alloy characterization. Mechanical properties were evaluated by Vickers hardness tests at room temperature (RT) and compression tests from RT to 1,273K. Strain rate dip tests were also carried out. It is found that most alloys are composed of two phases of E2{sub 1} as the primary phase and graphite as the precipitates, and that the volume fraction of graphite increases with increasing Fe content. Hardness and 0.2% flow stress at RT are raised with increasing Fe Content. At RT, 0.2% flow stress and fracture strength of Fe{sub 3}AlC alloy used are 2.9GPa and 3.4GPa, respectively. An alloy containing 40%Mn-20%Fe shows weak positive temperature dependence of strength at 700--800K, similar to the observation in some Co{sub 3}AlC alloys. Moreover, work-hardening coefficient of all alloys shows strong positive temperature dependence below 700K. These results suggest the occurrence of K-W related mechanism for plastic deformation in these alloys.
- Research Organization:
- Tohoku Univ., Sendai (JP)
- Sponsoring Organization:
- Japanese Ministry of Education, Science, Sports, and Culture
- OSTI ID:
- 20001661
- Report Number(s):
- CONF-981104--; ISBN 1-55899-458-0; ISSN 1067-9995
- Country of Publication:
- United States
- Language:
- English
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