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Low-Temperature Mechanical Alloying Of Cu-Fe and Cu-Ta Powders

Published online by Cambridge University Press:  10 February 2011

J.-H. He  and
E. Ma
J.-H. He
Affiliation:
Materials Science and Engineering Program, Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
E. Ma
Affiliation:
Materials Science and Engineering Program, Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
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Abstract

A model analysis is presented which explains ball-milling induced alloying in positive-heatof- mixing systems in terms of a dynamic balance between externally forced mixing and thermal phase decomposition mediated by deformation-enhanced population of defects. The possibility of eliminating the thermal decomposition to force single phase formation is examined by milling Cu- Fe and Cu-Ta powder mixtures at the liquid nitrogen temperature (LN2T). Over a range of compositions for Cu-Fe and almost the entire composition range for Cu-Ta, the two-phase region observed for room-temperature (RT) milling persisted after cryomilling. The moderate temperature dependence of milling-induced alloying is interpreted by analyzing the dynamics of the generation and annihilation of the nonequilibrium vacancies during deformation and impacts in a SPEX mill.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 637
Copyright
Copyright © Materials Research Society 1998

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References

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