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Origins of stored enthalpy in cryomilled nanocrystalline Zn

Published online by Cambridge University Press:  31 January 2011

Xinghang Zhang ,
Haiyan Wang ,
Magdy Kassem ,
Jagdish Narayan  and
Carl C. Koch
Xinghang Zhang
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695–7907
Haiyan Wang
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695–7907
Magdy Kassem
Affiliation:
Department of Mat. and Met.Engineering Faculty of Pet. & Mining Eng., Suez Canal University, Suez, Egypt
Jagdish Narayan
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695–7907
Carl C. Koch*
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina 27695–7907
*
a)Address all correspondence to this author. e-mail: carl_koch@ncsu.edu
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Abstract

Nanocrystalline Zn was prepared by cryomilling (mechanical attrition at liquid nitrogen temperature). Differential scanning calorimetry (DSC), x-ray diffraction, and transmission electron microscopy were used to study the structural changes and grain size distribution with milling time and subsequent annealing. Maxima in both stored enthalpy (for the low-temperature DSC peak) and lattice strain on the Zn basal planes were observed at the same milling time. Dislocation density on the basal planes is proposed as a major source for lattice strain and the measured stored enthalpy. The released enthalpy that might be due to grain growth is very small.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 12 , December 2001 , pp. 3485 - 3495
Copyright
Copyright © Materials Research Society 2001

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