BARC/PUB/2020/0523

 
 

Orientation-dependent solid solution strengthening in zirconium: a nanoindentation study

 
     
 
Author(s)

Lodh, A.; Pant, P.; Gulshan Kumar; Mani Krishna, K. V.; Tewari, R.; and others
(MSD)

Source

Journal of Materials Science, 2020. Vol. 55 (10): pp. 4493-4503

ABSTRACT

Orientation-dependent solid solution strengthening was explored through a combined microtexture plus nanoindentation study. Pure zirconium (6N purity crystal-bar Zr) and commercial Zircaloy-2 were investigated for comparison. Local mechanical properties were estimated through finite element (FE) simulations of the unloading part of the nanoindentation load-displacement response. Combinations of ‘averaging’ scheme and constitutive relationship were used to resolve uncertainty of FE-extracted mechanical properties. Comparing the two grades, non-basal oriented grains showed an overall hardening and increase in elastic modulus. In contrast, insignificant change was observed for basal (or near-basal) oriented grains. The strengthening of non-basal orientations appeared via elimination of the lowest hardness / stiffness values without a shift in the peak value. Such asymmetric development brought out the clear picture of orientation-dependent solid solution strengthening in zirconium.

 
 
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