Hardness behaviour in B2 pseudo-binary systems

Ab initio calculations of elastic properties of Ru1−xNixAl superalloys

“…23, a negative Cauchy pressure is characteristic of systems with covalentlike contribution to atomic bonding and we suppose this type of bonding might cause the enhanced hardness of ͑Ru,Ni͒Al alloys observed experimentally in Ref. 24. Of course, there are many other possible sources of enhancement of the alloys' hardness ͑such as lattice mismatch, presence of dislocations, nonstoichiometry, etc.͒ but we suggest that interatomic bonding should play the main role in solid solution hardening.…”

“…2͑c͔͒ is quite similar to that of the hardness of ͑Ru,Ni͒Al alloys. 24 We suggest that the unusual behavior of the elastic constants of ͑Ru,Ni͒Al originates from the electronic topological transitions. Indeed, we have plotted the Fermi surfaces for intermetallics RuAl, and NiAl, as well as for ͑Ru 100−x Ni x ͒Al alloys with x = 20, 40, 60, 80 at.…”

Platinum-group-metal-based intermetallics as high-temperature structural materials

“…[65][66][67][68][69][70][71][72][73][74] Mechanical properties, microstructure, and oxidation resistance of RhAl and RhAl-X (X = B, Co, Fe, Ti, Ni, and Ir) have been investigated. Another interesting B2 intermetallic compound is IrAl.…”

Preliminary investigation on solid solution softening effects on NiAl based alloys induced by minor Ru alloying addition

“…This is consistent with the previous results which show that ruthenium has higher solubility in NiAl. [18][19][20][21] Long range order degree As well known, the long range order (LRO) degree can be determined from the intensity of the superlattice reflection in relation to the fundamental XRD lines of the CsCl type crystal structure according to the following expression, in which (100) and (110) are chosen as the superlattice and fundamental reflections respectively 24 where I s and I f are the intensities of the superlattice and fundamental lines after the annealing treatment respectively while I s 0 and I f 0 are the intensities of the same lines for fully ordered sample. In the present study, the stoichiometric NiAl was considered as the baseline alloy.…”