Effect of alloying elements on martensitic transformation in the binary NiAl({beta}) phase alloys
- Tohoku Univ., Sendai (Japan)
The characteristics of the B2({beta}) to L1{sub 0}({beta}{prime}) martensitic transformation in NiAl base alloys containing a small amount of third elements have been investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and transmission electron microscopy (TEM). It is found that in addition to the normal L1{sub 0} (3R) martensite, the 7R martensite is also present in the ternary alloys containing Ti, Mo, Ag, Ta, or Zr. While the addition of third elements X (X: Ti, V, Cr, Mn, Fe, Zr, Nb, Mo, Ta, W, and Si) to the binary Ni{sub 64}Al{sub 36} alloy stabilizes the parent {beta} phase, thereby lowering the M{sub s} temperature, addition of third elements such as Co, Cu, or Ag destabilizes the {beta} phase, increasing the M{sub s} temperature. The occurrence of the 7R martensite structure is attributed to solid solution hardening arising from the difference in atomic size between Ni and Al and the third elements added. The variation in M{sub s} temperature with third element additions is primarily ascribed to the difference in lattice stabilities of the bcc and fcc phases of the alloying elements.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 382498
- 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: 9 Vol. 27; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM ALLOYS
BCC LATTICES
CALORIMETRY
CHEMICAL COMPOSITION
CHROMIUM
COBALT
COPPER
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
FCC LATTICES
INTERMETALLIC COMPOUNDS
IRON
MANGANESE
MELTING
METALLURGICAL EFFECTS
MOLYBDENUM
NICKEL ALLOYS
NIOBIUM
SAMPLE PREPARATION
SILICON
SILVER
SOLID SOLUTIONS
TANTALUM
TITANIUM
TRANSMISSION ELECTRON MICROSCOPY
TUNGSTEN
VANADIUM
X-RAY DIFFRACTION
ZIRCONIUM