Synthesis of metastable phases in Al-Nb powders by mechanical alloying
- Inst. for Materials and Advanced Processes, Univ. of Idaho, Moscow, ID (US)
Recently there have been many investigations on the synthesis and properties of transition metal trialuminides based on titanium, zirconium, vanadium, niobium and tantalum for use as structural materials in an elevated temperature environment. This interest is due to their high strength-to-density ratios, high melting points and excellent oxidation resistance. Amongst these, niobium trialuminide (NbAl{sub 3}) has a high melting point (1605{degrees} C), possesses adequate oxidation resistance (a result of the formation of a protective alumina over-layer and a density (4.54 g/cc) which is lower than that of advanced Ni{sub 3}Al-based compounds (7.6 g/cc). However, NbAl{sub 3} melts congruently and since it has an extremely limited homogeneity range, it is difficult to ensure that the chemistry falls in this desired narrow range. Further, due to the intrinsic brittleness, niobium aluminide ingots crack during solidification. Some of these problems can be overcome by producing the NbAl{sub 3} compound through the powder metallurgy route. This paper reports on the successful synthesis of homogeneous NbAl{sub 3} and amorphous phases by mechanical alloying starting from elemental powders.
- OSTI ID:
- 6979549
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 27:4
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanical alloying to produce L1{sub 2} phases in the Al-Zr system
METALLURGICAL PROGRESS REPORT NUMBER 14 FOR THE PERIOD OF JANUARY 1, 1962 TO MARCH 31, 1962
Related Subjects
ALUMINIUM ALLOYS
METALLURGY
PHASE STUDIES
NIOBIUM ALLOYS
AMORPHOUS STATE
BRITTLENESS
CORROSION RESISTANT ALLOYS
CRACKS
MELTING POINTS
OXIDATION
POWDERS
SOLIDIFICATION
SYNTHESIS
TEMPERATURE RANGE 1000-4000 K
ALLOYS
CHEMICAL REACTIONS
MECHANICAL PROPERTIES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
360101* - Metals & Alloys- Preparation & Fabrication
360102 - Metals & Alloys- Structure & Phase Studies