Microstructural development in complex nickel-aluminum bronzes

The Effect of Concurrent Straining on Phase Transformations in NiAl Bronze During the Friction Stir Processing Thermomechanical Cycle

“…Details of the constitution and transformations that occur in NiAl bronze have been given elsewhere. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Material conforming to the UNS95800 composition in Table I solidifies at %1323 K (1050°C) as a bcc b phase. During slow cooling, the primary a fcc terminal solid solution begins to form in the b with a Widmannsta¨tten morphology at about 1273 K (1000°C).…”

“…Measured dwell times above T % 1173 K (900°C) (T % 0.9 T melt ) varied from 2.2 to 8.7 seconds for such processing conditions. [5] The as-cast NiAl bronze material of interest in these investigations exhibits a characteristic series of phase transformations [5,[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] that commence as the temperature increases above T % 0.8 T melt (T % 1073 K (800°C)), so dwell times at such temperatures as well as the local peak temperature will be factors determining the extent to which such transformations attain equilibrium. A procedure involving quantitative analysis of stir zone microstructures resulting from FSP-induced transformations was used to assess local peak temperatures in this alloy.…”

A microtexture investigation of recrystallization during friction stir processing of as-cast NiAl bronze

“…[28,29,30] Here, the B2 and D0 3 structures haveinteratomic spacings that differ by less than 1pct and therefore wouldbeexpected to exhibit essentially identical EBSD patterns. In fact, EBSD patterns were obtained from the coarse globular particles in the present work, but it was not possiblet od istinguish the lattice as either B2 or D0 3 ,a nd energy-dispersive spectrometry (EDS) would be requiredi no rder to distinguish these phases.…”

Different methods of measuring synergy between cavitation erosion and corrosion for nickel aluminium bronze in 3.5% NaCl solution

“…The alloy's property comes from a very complex network of microstructures. It generally consists of columnar grains of face centred cubic (FCC) copper-rich solid solution known as α-phase and a small volume fraction of β-phase or retained martensitic β'-phase, surrounded by a series of intermetallic Fe-rich kappa phases [14], [16], [44]- [46].…”