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Resistivity of Short-Range and Long-Range Order Changes in Ni4Mo

Published online by Cambridge University Press:  21 February 2011

T. S. Lei ,
K. Vasudevan  and
E. E. Stansbury
T. S. Lei
Affiliation:
National Taiwan Institute of Technology, Taipei, Taiwan.
K. Vasudevan
Affiliation:
Dept. of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37916.
E. E. Stansbury
Affiliation:
Dept. of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37916.
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Abstract

Short-range order (SRO) and long-range order (LRO) reactions in Ni Mo as a function of room temperature deformation ahd thermal treatments betwean −269 and 1300°C are Reported. Resistivity results show that SRO is dispersed by heating near 1300°C and by cold working to 68% reduction of area (RA). The resistivity decreases to a minimum at 68% RA after which an increase is attributed to an increase in defect density.

The resistivity as a function of variations in the time-temperature history is reported. Cooling at 60°C/min; results in the maximum “frozen in” SRO with resistivity of 144 μohm cm at 25°C; th8 resistivity of the LRO state obtained on slow cooling is 48 μohm cm. At −269°C, the resistivities are 139 and 8 μohm cm for the SRO and LRO states respectively. Correlations relate kinetics and microstructures to resistivity changes during heating, cooling and isothermal SRO-LRO transformations. Preliminary results of reheating fully ordered samples to near 868°C and quenching are reported. Results are discussed with relevance to existing theories.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 39: Symposium G – High-Temperature Ordered Intermetallic Alloys I , 1984 , 163
Copyright
Copyright © Materials Research Society 1985

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