Processing and properties of Nb5Si3 and tough Nb5Si3/Nb laminates

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

“…6) alloys, however, only a few studies have been made with emphasis on controlling the A2/D8 l lamellar microstructure formed by the eutectoid reaction of tP32 phase 23,39,40) Microstructural control to form alternating layers of ductile/brittle phases is one option for enhancing room temperature toughness of the alloys. 14,15,20,25,41,42) The major interest of the present study is in microstructural control through eutectoid reaction of tP32 phase. This basic strategy extends to the Nb-Ti-Si ternary system, in which improvement in room temperature toughness and oxidation resistance can be expected.…”

“…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.…”

Microstructure and sliding-wear behavior of tungsten-reinforced W-Ni-Si metal-silicide in-situ composites

“…represent the largest family of intermetallic compounds having attractive attributes for elevated-temperature mechanical and environmental properties and, hence, are well recognized as a new family of highand/or ultrahigh-temperature candidate structural materials, because of their excellent combinations of high melting point, low density, high elastic modulus, and excellent oxidation resistance. [1][2][3][4][5][6][7][8][9][10][11][12] From a tribological point of view, these silicidebased intermetallic alloys also have excellent tribological properties (e.g., abrasive and adhesive wear resistance as well as a low coefficient of friction, due to their intrinsic roomand high-temperature high hardness and their unique covalent-dominated intermetallic atomic-bonding characteristics) and are, therefore, a new class of promising advanced wearresistant candidate materials for tribological components working under corrosive and high-temperature hostile service conditions. [13][14][15][16][17][18] However, like most intermetallic alloys, the existence of intrinsic room-temperature brittleness and lack of adequate strength and creep resistance at elevated temperatures are currently the main obstacles that prevented the materials from industrial applications as either structural or tribological bulk components.…”

Deformation Mechanisms in Niobium Silicide-Based Composites

“…Powder metallurgy (see Chapter 3.25,this volume) and foil-laminate processing (see Chapter 3.24, this volume) Kajuch et al, 1992Kajuch et al, , 1995 approaches have also been employed. Each of the above processes provides a characteristic microstructure.…”