Shock-induced displacive transformations in tantalum and tantalum-tungsten alloys
- Lawrence Livermore National Lab., CA (United States)
A recent investigation on the deformation substructure of shocked tantalum by transmission electron microscopy (TEM) has for the first-time revealed that a displacive omega transformation can also take place in tantalum (a group V transition metal) under a high shock peak pressure (45 GPa). Plate- or lath-like {omega} phase ({omega}{prime} hereafter) has been observed within shocked tantalum, which is considered to be unusual since tantalum has a bcc structure and exhibits no equilibrium phase transformation up to its melting temperature at ambient pressure. The occurrence of displacive omega transformation within shocked tantalum is of great interest because it provides not only an effective strengthening mechanism for tantalum and tantalum alloys but also an opportunity to study and understand the mechanisms of displacive {beta} {yields} {omega}{prime} transition induced by high strain-rate deformation. Results from the investigation of displacive omega transformation in tantalum and tantalum-tungsten alloy are reported and discussed here.
- Sponsoring Organization:
- Department of Defense, Washington, DC (United States); USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 651157
- Report Number(s):
- CONF-980202-; ISSN 1359-6462; TRN: 98:010453
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 4-5; Conference: Annual meeting of the Minerals, Metals and Materials Society (TMS), San Antonio, TX (United States), 15-19 Feb 1998; Other Information: PBD: 4 Aug 1998
- Country of Publication:
- United States
- Language:
- English
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