High temperature phase stability of Ti-(45.5-48)Al-2Nb-2Cr

Book · Sat Dec 30 23:00:00 EST 1995

OSTI ID:225092

Ahmed, T; Rack, H J ^[1]; Guillard, S ^[2]; Seetharaman, V ^[3]; Chesnutt, J C ^[4]

---

1. Clemson Univ., SC (United States)
2. Concurrent Technologies Corp., Johnstown, PA (United States)
3. UES, Inc., Dayton, OH (United States)
4. GE Aircraft Engines, Cincinnati, OH (United States)

The high temperature phase stability of Ti-45.5Al-2Nb-2Cr (cast+HIPed and forged+heat treated) and Ti-48Al-2Nb-2Cr (cast and cast+HIPed) has been determined utilizing calorimetric differential thermal analysis (CDTA) and in-situ high temperature x-ray diffraction (HTXRD). It is observed that both alloys, independent of processing condition, were three phase ({alpha}{sub 2} + {gamma} + {beta}) at room temperature, with the {beta} phase volume fraction increasing with increase in Al content. CDTA indicated that four reversible reactions occur during heating/cooling of Ti-45.5Al-2Nb-2Cr while only three reversible reactions were observed in Ti-48Al-2Nb-2Cr. The transformation paths occurring on heating/cooling of these alloys were suggested on the basis of CDTA and HTXRD results.

• OSTI ID: 225092
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CALORIMETRY
CASTING
CHROMIUM ALLOYS
DIFFERENTIAL THERMAL ANALYSIS
EXPERIMENTAL DATA
FORGING
HEAT TREATMENTS
HOT PRESSING
INTERMETALLIC COMPOUNDS
NIOBIUM ALLOYS
OPTICAL MICROSCOPY
PHASE STUDIES
PHASE TRANSFORMATIONS
SAMPLE PREPARATION
TITANIUM ALLOYS
X-RAY DIFFRACTION