Effect of Au addition on the microstructure and mechanical properties of NiAl intermetallic compound

Sheng, Li Yuan; Zhang, Wei; Jianting, Guo; Yang, Fang; Liang, Yongchun; Ye, Hengqiang

doi:10.1016/j.intermet.2009.10.015

Cited by 52 publications

(17 citation statements)

References 18 publications

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“…Several attempts have been made to improve the room temperature ductility of NiAl intermetallics alloy through the addition of alloying elements, reduction of grain size and other solidification processing [10,11]. Furthermore, it has been shown that the addition of elements such as Cu, Co, Mo, Ti and Fe is particularly beneficial in improving the mechanical properties of NiAl intermetallic alloy [12][13][14][15][16][17]. Among these additions, Cu is an excellent addition to improve the room ductility of NiAl intermetallic alloy [18].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Fracture Properties of NiAl Intermetallic Alloy with Different Copper Contents

Chen

2016

Applied Sciences

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Abstract:The deformation behavior and fracture characteristics of NiAl intermetallic alloy containing 5~7 at% Cu are investigated at room temperature under strain rates ranging from 1ˆ10´3 to 5ˆ10 3 s´1. It is shown that the copper contents and strain rate both have a significant effect on the mechanical behavior of the NiAl alloy. Specifically, the flow stress increases with an increasing copper content and strain rate. Moreover, the ductility also improves as the copper content increases. The change in the mechanical response and fracture behavior of the NiAl alloy given a higher copper content is thought to be the result of the precipitation of β-phase (Ni,Cu)Al and γ'-phase (Ni,Cu) 3 Al in the NiAl matrix.

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Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Fracture Properties of NiAl Intermetallic Alloy with Different Copper Contents

Chen

2016

Applied Sciences

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“…e microstructure of the Au-doped intermetallic alloy showed a honeycomb appearance (Figure 3(c)); that is, there is not a tendency to form precipitates as in the case of Ag-doped intermetallic alloy. Sheng et al [59] found that the effect of addition of 1% Au on the microstructure of the NiAl intermetallic alloy causes a grain size reduction and the formation of α-AlAu 2 precipitates. It can be assumed that the absence of the α-AlAu 2 phase is due to the lower content of Al in Ni 3 Al compared to that in NiAl.…”

Section: Microstructural Analysismentioning

confidence: 99%

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Ramos-Hernández

Porcayo-Calderón

Mayén³

et al. 2018

Advances in Materials Science and Engineering

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is paper discusses the effect of the addition of noble metals on the microstructure, mechanism, and oxidation kinetics of the Ni 3 Al intermetallic alloy. Ni 3 Al was doped with 1% (atomic percent) of Au, Ag, Pd, and Pt. Oxidation behavior of the alloys was evaluated at 900, 1000, and 1100°C in O 2 for 24 hours. XRD analysis showed that the addition of noble metals favored the oxide growth on preferential crystallographic planes. In addition, the preferential substitution of the noble metals in the Ni 3 Al structure modifies the surface composition by increasing the Al/Ni ratio. It was observed that most of the alloys showed a subparabolic behavior, and only the intermetallic base and the alloy doped with Ag show a parabolic behavior at 900°C. e developed oxides were analyzed both superficially and in cross section by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDXA). It was evident that only the intermetallic base showed the formation of a duplex oxide scale (Al 2 O 3 /NiO). e alloys doped with noble metals showed the oxide growth practically of pure Al 2 O 3 . is was due to a decrease in the diffusion of the Ni cations because of the presence of the noble metals in the crystalline structure.

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“…However, the lack of ductility at room temperature and a poor strength at high temperatures prevent its use as a candidate for replacement of Ni-based super alloys. So, many efforts have been made to reduce the brittleness of NiAl intermetallic compounds that can be classified as changing the alloy sliding system [1], the refinement of grain ternary or higher order [2,3], and the incorporation or precipitation of a ductile phase [4]. It has been suggested in the literature [5] that fragile materials can develop some ductility by refining the grain below a critical size.…”

Section: Introductionmentioning

confidence: 99%

Morphology and structure effect of Ti additive on the solid-state reaction between Ni and Al powders during mechanical alloying

Chérif

Bachaga

Saurina

et al. 2016

Int J Adv Manuf Technol

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In this study, the mixtures of Ni, Al, and Ti elemental powders with nominal compositions Ni-40at.% Al and Ni30at.% Al-10at.% Ti were fabricated by mechanically alloying technique. The structural and morphological changes during high-energy mechanical alloying were investigated by X-ray diffraction and scanning electron microscopy. Differences in the kinetics of solid-state reactions which depend on the differences in the individual properties were found. The final products of the mechanical alloying process were nanocrystalline fcc-Ni(Al) and fcc-Ni(Al, Ti) solid solutions with a mean crystallite sizes in the range of a few nanometers. As a result, although the Ti addition was found to accelerate the formation of the solid solution in Ni-Al alloy, it results in a coarser microstructure.

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Effect of Au addition on the microstructure and mechanical properties of NiAl intermetallic compound

Cited by 52 publications

References 18 publications

Mechanical Behavior and Fracture Properties of NiAl Intermetallic Alloy with Different Copper Contents

Mechanical Behavior and Fracture Properties of NiAl Intermetallic Alloy with Different Copper Contents

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al

Morphology and structure effect of Ti additive on the solid-state reaction between Ni and Al powders during mechanical alloying

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Effect of Au addition on the microstructure and mechanical properties of NiAl intermetallic compound

Cited by 52 publications

References 18 publications

Mechanical Behavior and Fracture Properties of NiAl Intermetallic Alloy with Different Copper Contents

Mechanical Behavior and Fracture Properties of NiAl Intermetallic Alloy with Different Copper Contents

Effect of the Noble Metals Addition on the Oxidation Behavior of Ni3Al

Morphology and structure effect of Ti additive on the solid-state reaction between Ni and Al powders during mechanical alloying

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Effect of the Noble Metals Addition on the Oxidation Behavior of Ni₃Al