Amorphous powders of Al-Hf prepared by mechanical alloying

Conference · Fri Jan 01 04:00:00 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 Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 7010556
• Report Number(s): LA-UR-88-1820; CONF-880667-2; ON: DE88014459
• Country of Publication: United States
• Language: English

Related Subjects

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