The effect of hydrostatic pressurization on the microhardness and compressive behavior of the porous Mn-modified Ll{sub 2} titanium trialuminide
- Polish Academy of Sciences, Warsaw (Poland). High Pressure Research Center
- Univ. of Waterloo, Ontario (Canada). Dept. of Mechanical Engineering
Microhardness and compressive mechanical properties of the Mn-modified Ll{sub 2} titanium trialuminide containing porosities from 0.07 to 0.14 and a small volume fraction of the Al{sub 3}Ti particles were studied after hydrostatic pressurization at 2 GPa. It is found that the reduction in porosity after hydrostatic pressurization (densification) increases approximately linearly with increasing initial porosity. Compressive yield strength, strength to fracture, and permanent deformation to fracture of both unpressurized and pressurized material decrease linearly with increasing actual volume fraction of porosity. At the same level of actual porosity, the compressive yield strength of the hydrostatically pressurized Ll{sub 2} titanium trialuminide is always higher and its permanent deformation to fracture is always lower than that of the unpressurized titanium trialuminide. Such a behavior indicates that the pressure-induced dislocations generated at elastic discontinuities such as pores and the Al{sub 3}Ti particles become immobilized. This, in turn, leads to a quick work hardening. The behavior of compressive yield strength of the hydrostatically pressurizes Ll{sub 2} titanium trialuminide is opposite to that observed for a B2 NiAl intermetallic hydrostatically pressurized to 1.4 GPa and subsequently compressive and tensile tested by Margevicius and Lewandowski. This difference is discussed in terms of different crystallographic structure of titanium trialuminides (Ll{sub 2}) and NiAl (B2).
- Sponsoring Organization:
- Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
- OSTI ID:
- 438592
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 1 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
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