Investigation of microstructure and mechanical properties of hot worked NiAl bronze alloy with different deformation degree

Abstract

a b s t r a c tIn this study, the forged NiAl bronze (NAB) were hot rolled with the deformation degree of 40%, 60%, 80%, 90% and 95% at 850°C, respectively. Effects of rolling deformation degree on the microstructure and mechanical properties of the NAB alloy were investigated. Scanning electron microscope (SEM), electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) methods were used to characterize the microstructure. The results show that α grains are refined by the dynamic recovery and recrystallization, penetration of β phase into α phase and particle-stimulated nucleation (PSN) of recrystallization during rolling. The refined grains make a main contribution to the increase of mechanical properties of rolled NAB. When the deformation degree is increased to 80%, the optimum tensile properties with ultimate strength of 861.37 8.5 MPa, yield strength of 634.5 77 MPa and elongation of 19.3 70.05% is obtained. With further increasing the deformation degree, the strength of rolled NAB alloy increase and the elongation decrease due to the increase of work hardening effect and the formation of martensitic nano-twins.

Proliferation and osteogenic differentiation of rat BMSCs on a novel Ti/SiC metal matrix nanocomposite modified by friction stir processing

“…The grounded samples were polished using diamond paste with a particle size of 0.5 μm and then etched with a solution of 6% HNO3+2% HF in water for a few seconds. This sample preparation method meets the ASTM E3–2011 standard and has been widely used in pervious investigations464748. Microstructures were observed using a Quanta 200 microscope as well as scanning electron microscopy (SEM, FEI Company, The Netherlands) and energy dispersive x-ray spectroscopy (EDS, Oxford Inca).…”

Microstructures, mechanical, and biological properties of a novel Ti-6V-4V/zinc surface nanocomposite prepared by friction stir processing

“…Samples with dimensions of 1×1 cm were cut from the SZ at the surface of the FSP plate for microstructural examination, mechanical testing, and cell experiments. Before making microstructural observations, samples were cut, ground, and polished according to standard procedures and were then etched with a solution consisting of 2% HF and 6% HNO 3 for 5 s. [28][29][30] Longitudinal sections of the TC4/Zn MMNC were prepared using a wire cutting machine and were then thinned using an ion thinning instrument from the upper surface to the bottom. Cylindrical implants 2 mm in diameter and 6 mm in length were cut from the SZ using the wire cutting machine for the in vivo study.…”

Tribocorrosion behavior of nickel-aluminium bronze sliding against alumina under the lubrication by seawater with different halide concentrations

“…It can be seen that the diffraction peaks of the α phase, β´ martensite phase, and another phase, including aluminium-iron-nickel intermetallics, appeared in the tested NAB alloy, which was consistent with the SEM observation results. From the previously reported literature, it is well known that the κ Ⅰ , κ Ⅱ , and κ Ⅳ phases were iron-enriched precipitates on the structure of Fe 3 Al, while the κ Ⅲ phase was nickel-enriched based on NiAl [18]. Thus, combined with the microstructural image in Fig.…”