Inhomogeneous microstructure and mechanical properties of friction stir processed NiAl bronze

Ni, D.R.; Xue, P.; Wang, D.; Xiao, B.L.; Ma, Zhiyuan

doi:10.1016/j.msea.2009.06.013

Cited by 80 publications

(41 citation statements)

References 36 publications

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“…This is due to the presence of inclusions and precipitates peculiar of NAB alloy. [35][36][37] Scanning electron microscopy (SEM) imaging revealed no significant pileup of the material for a penetration depth of about 5 lm (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

Application of spherical nanoindentation to determine the pressure of cavitation impacts from pitting tests

2011

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This article focuses on the use of spherical nanoindentation measurements to estimate the pressure of cavitation impacts and its statistical distribution. Indeed, nanoindentation techniques are supposed to represent an effective tool in this field due to the similarities between substrate deformation under liquid impact and indentation testing. First, nanoindentation experiments were used to extract the mechanical parameters of a Nickel-Aluminum-Bronze alloy; second, pitting tests were performed at different operating pressures, and the geometrical characteristics of the pits were measured; and finally, the spectra of impact pressure and loads responsible for material erosion were obtained by coupling the findings of indentation tests with the analysis of pitting tests. Results assessed the capability of the proposed methodology to quantify the hydrodynamic aggressiveness of the cavitating flow. This procedure, which assumes the material itself as a sensor that is able to detect the impact loads, could represent an alternative solution to pressure transducers in estimating the cavitation intensity.

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Section: Resultsmentioning

confidence: 99%

Application of spherical nanoindentation to determine the pressure of cavitation impacts from pitting tests

2011

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“…In region B and C, the microstructure also contains α, fine κII, and β′ phases, while the α phase has different morphologies between regions B and C. The morphology of α phase in region B is banded and that in region C is stream-like. According to Ni's study [19,20], the banded and stream-like α structure results from the incomplete dynamic recrystallization and intense plastic deformation during friction stir processing. Figure 3b, α grains boundaries and fine voids are clearly observed.…”

Section: Methodsmentioning

confidence: 99%

Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

Wang

et al. 2015

Metals

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NiAl bronze (NAB) alloy is prepared by using friction stir processing (FSP) technique at a tool rotation rate of 1200 rpm and a traverse speed of 150 mm/min. A post heat treatment is performed at the temperature of 675 °C. The effect of heat treatment on the microstructure and microhardness is studied. The results show that the microstructure of the FSP NAB alloy consists of high density dislocations, retained β phase (β′ phase) and recrystallized grains. When annealed at 675 °C, discontinuous static recrystallization (DSRX) takes place. The content of β′ phase gradually decreases and fine κ phase is precipitated. After annealing for 2 h, both the microhardness of the FSP sample in the stir zone (SZ) and the difference in hardness between the SZ and base metal decrease due to the reduction of the dislocation density and β′ phase, accompanying recrystallized grain coarsening. With further increasing of the annealing time to 4 h, the aforementioned difference in hardness nearly disappears.

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“…The common problem in cast NAB alloy is the reduction in mechanical and physical properties, due to the presence of shrinkage porosity. Coarse grains are prone to appear in the cast alloy due to poor casting 7 . Past researchers have found several problems such as insufficient penetration, loss of strength, high distortion, Heat Affected Zone (HAZ) cracks and formation of brittle phase from the fusion welding of aluminum bronze arising from the formation of transformation products of β' phases as the result of fast cooling.…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on Microstructure and Mechanical Properties of Friction Stir Welded Cast Nickel Aluminum Bronze Alloy (C95800)

et al. 2018

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In the present study, Friction Stir Welding (FSW) of Nickel Aluminum Bronze (NAB) alloy was carried out by varying the axial load, rotation speed and welding speed rate. Micro-structural analyses of these samples revealed the different grain sizes and shapes of the various zones. Hardness and tensile strength tests were carried out for the samples welded at different conditions such as axial load, welding speed and rotational speed. Grain refinement in the weld nugget zones was achieved for all welding conditions. The refined grains in weld nugget zone (WNZ) make a main contribution to the increase of mechanical properties of FSW welded NAB alloy. The microhardness of the stir zone and Thermo-Mechanically Affected Zone (TMAZ) was found to be higher than that of the base metal. Transverse tensile strength of weld joint was higher than that of the base metal. On the other hand, a lower or similar tensile strength value compared to the base metal was seen from other variable welding parameters. This was due to the tunnel defect in the welded nugget zone. ANOVA test result was used for finding out the contribution of the process parameter.

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Inhomogeneous microstructure and mechanical properties of friction stir processed NiAl bronze

Cited by 80 publications

References 36 publications

Application of spherical nanoindentation to determine the pressure of cavitation impacts from pitting tests

Application of spherical nanoindentation to determine the pressure of cavitation impacts from pitting tests

Effect of Post Heat Treatment on the Microstructure and Microhardness of Friction Stir Processed NiAl Bronze (NAB) Alloy

Effect of Process Parameters on Microstructure and Mechanical Properties of Friction Stir Welded Cast Nickel Aluminum Bronze Alloy (C95800)

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