Ordering in rapidly solidified Ni/sub 2/Mo

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(88)90001-4· OSTI ID:6100091

Kulkarni, U D; Dey, G K; Banerjee, S

Ordering processes in the Ni-Mo system have been a subject of several investigations. Although the ordering behaviour of the Ni/sub 4/Mo and the Ni/sub 3/Mo has been examined in detail, no such study has been reported in the case of the Ni/sub 2/Mo alloy. The lack of experimental work on ordering transformations in Ni/sub 2/Mo is presumably due to the difficulty in obtaining a single phase fcc alloy of this composition. Enhanced solid solubility of Mo in Ni, which accompanies rapid solidification processing (RSP) makes the formation of such a phase possible. The ordering processes in Ni-Mo based alloys show several remarkable features. Firstly, the alloy (15 - 28 at % Mo) quenched from the ..cap alpha.. -phase filed exhibit a short range order (SRO) characterized by the presence of intensity maxima at /1 1/2 0/ fcc positions of the reciprocal space. This state of SRO has been attributed to the occurrence of 1 1/2 O spinodal ordering in the system. Secondly, the transformation from the state of SRO to the equilibrium/metastable coherent long range ordered (LRO) structures appears to take place in a continuous manner at relatively low temperatures of aging. Three different coherent LRO structures, namely: the equilibrium Ni/sub 4/Mo (prototype structure D1/sub a/) and the metastable Ni/sub 3/Mo (DO/sub 22/) and Ni/sub 2/Mo (Pt/sub 2/Mo) structures have reported to evolve from the SRO alloy, depending upon the aging treatment and the composition of the alloy.

• Research Organization: Bhabha Atomic Research Centre, Trombay, Bombay (IN)
• OSTI ID: 6100091
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 22:4; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
AGING
ALLOY SYSTEMS
ALLOYS
BINARY ALLOY SYSTEMS
DATA
ELECTRONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
HIGH TEMPERATURE
INFORMATION
IRRADIATION
LATTICE PARAMETERS
LEPTONS
LOW TEMPERATURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
ORDER-DISORDER TRANSFORMATIONS
PHASE STUDIES
PHASE TRANSFORMATIONS
QUENCH AGING
QUENCHING
SCATTERING
SOLIDIFICATION
STOICHIOMETRY