Strength and ductile-phase toughening in the two-phase Nb/Nb5Si3 alloys

Solidification Process and Mechanical Behavior of the Nb/Nb₅Si₃ Two Phase Alloys in the Nb-Ti-Si System

“…6) Previous studies have demonstrated that the A2/D8 l twophase alloys in the Nb-Si binary system exhibit moderate toughness at ambient temperature and reasonable strength at elevated temperature. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] However the binary A2/D8 l twophase alloys with Nb-rich composition show insufficient oxidation resistance for practical use, 27) and therefore, the studies gradually evolve into multi-component systems by which balance is pursued between mechanical properties and environmental resistance. Much effort has been made to clarify the effect of alloying elements with the Nb-Si binary alloy system upon the mechanical properties and oxidation resistance.…”

Microstructures and oxidation behavior of some Molybdenum based alloys

“…Mo 3 Si-Mo 5 Si 3 composites showed excellent hardness, due to the presence of Mo 3 Si, but had a low toughness [74]. Nb ss -Nb 5 Si 3 alloys, on the other hand, have good low temperature toughness, as well as reasonable high temperature strength and creep resistance [37,[75][76][77].…”

Ductile-Phase Toughening of Brazed Joints

“…To provide focus, recall that the bridging mechanism of ductile-phase toughening, DC ss , scales with the diameter, 2R, and the area fraction, f, of this phase intercepted by the crack: [11][12][13][14] DC ss = fRv, where r o is the yield strength of the ductile phase and v is a work of rupture parameter governed by the plastic stretch, u c fi v = 2.5 u c /R. [11][12][13][14] Note that, to maximize the contribution to this toughening mechanism, the ductile phase should percolate through the joint, so that the area fraction term, f, participates fully.…”

“…[11][12][13][14] Note that, to maximize the contribution to this toughening mechanism, the ductile phase should percolate through the joint, so that the area fraction term, f, participates fully. Otherwise, the crack circumvents this phase and obviates the toughening.…”