Preparation of nanocrystalline alloys by mechanical alloying car

Details Preparation of nanocrystalline alloys by mechanical alloying car Preparation of nanocrystalline alloys by mechanical alloying car

1996-11-20

1998-11-17

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75357, 241223, 420900, B22F 904

Patent

active

058370307

ABSTRACT:
A process is described for preparing a nanocrystalline powder of an alloy of at least two metals by an intensive mechanical grinding step performed upon powders of the metals which make up the alloy. The grinding is performed at atmospheric pressure under an inert atmosphere, and is carried out at a temperature in the range of 100.degree.-400.degree. C. In this manner, one obtains crystallites of the alloy having a grain size lower than 100 nm by grinding for a period of time lower by about an order of magnitude than the time necessary to achieve this grain size by a similar grinding step carried out at ambient temperature.

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