Tungsten solution kinetics and amorphization of nickel in mechanically alloyed Ni-W alloys

Journal Article · Thu Dec 31 23:00:00 EST 1992 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90348-V· OSTI ID:6471561

Aning, A O ^[1]; Wang, Z; Courtney, T H ^[2]

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1. Morgan State Univ., Baltimore, MD (United States). Dept. of Electrical Engineering
2. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

The kinetics of solution of W, and the subsequent amorphization of Ni, in mechanically alloyed Ni-W alloys has been investigated. As W is a highly abrasive material in the energy intensive devices used for mechanical alloying, the authors studied the above reactions in different mills. One used hardened steel balls as the grinding media, and the other Al[sub 2]O[sub 3]. Abrasion is common to both mills, but Fe wear debris from the hardened steel enters into solution in the Ni rich phases whereas Al[sub 2]O[sub 3] debris is present as small dispersoids. The kinetics of W solution and those of subsequent amorphization do not appear strongly affected by the Fe in solution or the Al[sub 2]O[sub 3] dispersoid. Tungsten dissolves in crystalline Ni in amounts in excess of the equilibrium solubility during alloying. Amorphization of the Ni phase occurs if the W content in this phase exceeds ca. 28 at %. The kinetics of W solution in the crystalline Ni phase and of amorphization can be followed by X-ray analysis. The subsequent crystallization products, obtained by heating the amorphous phase to temperatures greater than about 1,000K, are primarily the intermetallic compounds Ni[sub 4]W and NiW.

• OSTI ID: 6471561
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:1; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
AMORPHOUS STATE
CALORIMETRY
CHEMICAL ANALYSIS
COHERENT SCATTERING
DATA
DIFFRACTION
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HEATING
INFORMATION
INTERMETALLIC COMPOUNDS
KINETICS
MACHINING
MICROSCOPY
MICROSTRUCTURE
MILLING
NICKEL ALLOYS
NICKEL BASE ALLOYS
NUMERICAL DATA
SCANNING ELECTRON MICROSCOPY
SCATTERING
SOLUBILITY
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TUNGSTEN ALLOYS
X-RAY DIFFRACTION