Amorphous powders of Al-Hf prepared by mechanical alloying

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:7010556

Schwarz, R B; Hannigan, J W; Sheinberg, H; Tiainen, T

We synthesized amorphous Al/sub 50/Hf/sub 50/ alloy powder by mechanically alloying an equimolar mixture of crystalline powders of Al and Hf using hexane as a dispersant. We characterized the powder as a function of mechanical-alloying time by scanning electron microscopy, x-ray diffraction, and differential scanning calorimetry. Amorphous Al/sub 50/Hf/sub 50/ powder heated at 10 K s/sup /minus/1/ crystallizes polymorphously at 1003 K into orthorhombic AlHf (CrB-type structure). During mechanical alloying, some hexane decomposes and hydrogen and carbon are incorporated into the amorphous alloy powder. The hydrogen can be removed by annealing the powder by hot pressing at a temperature approximately 30 K below the crystallization temperature. The amorphous compacts have a diamond pyramidal hardness of 1025 DPH. 24 refs., 7 figs., 1 tab.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7010556
• Report Number(s): LA-UR-88-1820; CONF-880667-2; ON: DE88014459
• Resource Relation: Conference: International powder metallurgy conference and exhibition, Orlando, FL, USA, 5 Jun 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
MATERIALS WORKING
HAFNIUM ALLOYS
AMORPHOUS STATE
ANNEALING
COMPACTS
HEXANE
HOT PRESSING
HYDROGEN
POWDERS
SCANNING ELECTRON MICROSCOPY
VICKERS HARDNESS
X-RAY DIFFRACTION
ALKANES
ALLOYS
COHERENT SCATTERING
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
HEAT TREATMENTS
HYDROCARBONS
MICROSCOPY
NONMETALS
ORGANIC COMPOUNDS
PRESSING
SCATTERING
360101* - Metals & Alloys- Preparation & Fabrication