Wyniki wyszukiwania - BazTech

Ograniczanie wyników

1 Archives of Materials Science and Engineering

1 2009

Znaleziono wyników: 1

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: ductilization

Sortuj według:

Ogranicz wyniki do:

Ductilization of Ni3Al by alloying with boron and zirconium

Hyjek P., Sulima I., Wierzbiński S.

Archives of Materials Science and Engineering

2009

Vol. 40, nr 2

69-74

Purpose: The investigation of Ni₃AlBZr alloys was carried out to determine the influence of small zirconium and boron additions on the microstructure and mechanical properties, particularly with respect to room-temperature, and different strain rate conditions. Design/methodology/approach: Additions of both boron 0.26 at.% and zirconium from 0.3 to 1.5 at.% results in higher strength than exhibited by unalloyed Ni3Al. The sequence of structural changes of Ni3Al-based alloy has been correlated with mechanical properties, determined in uniaxial compression tests. Two ranges of work hardening have been identified on the stress-strain curves of these alloys. It was found that the first range of deformation corresponds to the intergranular slip system operating within individual grains, while the second one is connected with transgranular slip. Findings: Structural observations of A and B alloys showed that zirconium addition causes a decrease of the average grain size. On the mechanical properties of investigated alloys the increasing yield stress and hardness were observed in enlarging zirconium additions. However, the enlarged addition of zirconium causes a decrease of extension. Addition to an intermetallics compound Ni₃Al of such elements as boron (0.26 at.%) and zirconium (0.3 - 1.5 at.%) can be accepted as optimum from susceptibility to plastic deformation point of view. Research limitations/implications: The main limits for application of the polycrystalline Ni3Al phases is a poor strength and creep properties at high temperatures. The improvement of mechanical proprieties of Ni₃Al phase required small addition of suitable alloying elements. Practical implications: The results of investigations as well as the conclusions may be used for improvement of alloys processing based on Ni₃Al intermetallics compound. In well-considered peculiarity selection of alloyed additions and also processing parameters it is possible to steer in a limited range of mechanical properties of these alloys. Originality/value: The results of investigations expand knowledge about processing of the alloys based on Ni₃Al phase, and in consequence, to apply it in many branches of industry.