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Indentation Testing of Bulk Zr0.5Hf0.5Co1-xIrxSb0.99Sn0.01 Half-Heusler Alloys

Published online by Cambridge University Press:  01 February 2011

Melody A Verges ,
Paul J Schilling ,
Jeffrey D Germond ,
Puja Upadhyay ,
William K Miller ,
Nathan J. Takas  and
Pierre F. P. Poudeu
Melody A Verges
Affiliation:
mverges@uno.edu, University of New Orleans, Mechanical Engineering, New Orleans, Louisiana, United States
Paul J Schilling
Affiliation:
pschilli@uno.edu, University of New Orleans, Mechanical Engineering, New Orleans, Louisiana, United States
Jeffrey D Germond
Affiliation:
jgermond@uno.edu, University of New Orleans, Mechanical Engineering, New Orleans, Louisiana, United States
Puja Upadhyay
Affiliation:
pupadhya@uno.edu, University of New Orleans, Mechanical Engineering, New Orleans, Louisiana, United States
William K Miller
Affiliation:
wkmille1@uno.edu, University of New Orleans, Mechanical Engineering, New Orleans, Louisiana, United States
Nathan J. Takas
Affiliation:
ntakas@uno.edu, University of New Orleans, Advanced Materials Research Institute, 2000 Lakeshore Dr., New Orleans, Louisiana, 70148, United States, 1(504)280-5629, 1(504)280-3185
Pierre F. P. Poudeu
Affiliation:
ppoudeup@uno.edu, University of New Orleans, Chemistry, 2000 Lakeshore Dr, SC2005, New Orleans, Louisiana, 70148, United States, (504)2801057, (504)2803185
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Abstract

Indentation tests were performed to assess the influence of compositional changes on the mechanical properties of several half-Heusler compounds with the general composition Zr0.5Hf0.5Co1-xIrxSb0.99Sn0.01 (x=0.0,0.1,0.3,0.5,0.7). These samples were synthesized by high temperature solid-state reactions and were consolidated by hot-pressing. Indentation measurements were obtained using both microhardness testing (Vickers) and depth-sensing nanoindentation. These measurements were used to determine the microhardness and the elastic modulus of each half-Heusler compound. The Vickers hardness values were found to range between 876 and 964. A slight increase in hardness was observed with the addition of iridium. The elastic stiffness values ranged from 229 GPa to 246 GPa. Here, a slight decrease in stiffness was observed with the addition of iridium.

Keywords

thermoelectrichardnessnano-indentation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1267: Symposium DD – Thermoelectric Materials 2010-Growth, Properties, Novel Characterization Methods and Applications , 2010 , 1267-DD05-23
Copyright
Copyright © Materials Research Society 2010

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