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Idrisova, S. R.
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article
Influence of long-ordering parameter and boron microalloying on mechanical properties of nanocrystalline intermetallic compound Ni <inf>3</inf> Al
Abstract
<p>The influence of boron on the thermal stability and mechanical behaviour of nano- and submicrocrystalline Ni<sub>3</sub>Al intermetallic compounds was investigated by comparing a high-purity material with a boron-doped (0.1 wt%) compound. The nanocrystalline structure was obtained by high pressure torsion (HPT) on a Bridgman anvil-type unit. It was shown that due to HPT the entirely disordered structure with a grain size of 20 nm was formed in the material. The non-monotonic dependence of mechanical properties (at 20°C) on temperature of annealing was revealed. The material in an entirely disordered nanocrystalline state has the maximum strength and ductility. Partial formation of the long-range ordering parameter in the range of nano- and submicrocrystalline grain size correlates with the loss of ductility and decrease in strength. Growth in ductility and strength is observed with increasing grain size. The influence of a grain size and long-range ordering parameter on mechanical properties is evidently connected with specific features of plastic deformation and failure processes.</p>