The effect of density anisotropy on the yielding and flow behavior of partially consolidated powder compacts
- Air Force Research Lab., Wright Patterson AFB, OH (United States). Materials and Manufacturing Directorate
The effect of density anisotropy on the flow behavior of partially consolidated powder compacts of an alpha-two titanium aluminide alloy (Ti-24Al-11Nb) was established by conducting hot compression tests on samples made by hot die pressing or hot isostatic pressing (hipping). For the former consolidation method, in which anisotropic density distributions were developed, the upset tests were conducted both parallel and perpendicular to the die pressing direction. The flow stress results from these experiments, as well as those from the tests on the hipped material, were interpreted in terms of calculations of the stress intensification factor ({phi}). When the stress intensification factors were plotted as a function of areal relative density, rather than volumetric relative density, a unique dependence of {phi} on density was obtained. This dependence showed a smooth transition from a behavior measured by others for the early stages of densification to a behavior theoretically predicted for the latter stages of densification, in which isolated pores are closed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 616269
- 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: 5 Vol. 29; ISSN MMTAEB; ISSN 1073-5623
- Country of Publication:
- United States
- Language:
- English
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