The mechanism of order-induced intrinsic embrittlement in a stoichiometric Ni4Mo alloy by TEM and 3DAP characterization

Cheng, Xiaoying; Liu, W.Q.; Li, Qiang

doi:10.1016/j.msea.2007.08.072

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…The inset is a secondary electron image showing the surface exposed by in situ fracture of a specimen aged for 100 h at 700°C. In this case, fracture occurs by an intergranular mode [4,6]. As can be seen, the grain boundary is considerably depleted in Mo consistent with the transmission/scanning electron microscopy results of Fig.…”

Section: Resultssupporting

confidence: 88%

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Enhancing the Corrosion Resistance of Near-Stoichiometric Ni4Mo Alloy by Doping with Yttrium

Tawancy

2012

Metallogr. Microstruct. Anal.

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It is shown that doping with yttrium can significantly improve the corrosion resistance of near-stoichiometric Ni 4 Mo alloy, which is otherwise susceptible to severe intergranular attack in the ordered condition. A oneto-one correspondence is found to exist between corrosion resistance and morphology of ordered Ni 4 Mo. The susceptibility to intergranular corrosion is correlated with a discontinuous grain boundary reaction resulting from selfgenerated recrystallization to accommodate the strain associated with continued growth of the ordered crystals. Doping with Y is found to maintain an ultrafine ordered microstructure suppressing the occurrence of self-generated recrystallization and, therefore, improving the corrosion resistance.

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Section: Resultssupporting

confidence: 88%

“…Earlier studies have shown that long-range ordering to Ni 4 Mo could have adverse effects on ductility [4][5][6][7] and corrosion resistance [8]. Recently, however, it has been reported that the ductility of Ni 4 Mo could be significantly improved by minor but critical additions of yttrium [9,10].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Corrosion Resistance of Near-Stoichiometric Ni4Mo Alloy by Doping with Yttrium

Tawancy

2012

Metallogr. Microstruct. Anal.

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“…It is observed that the Mo content at the grain boundary is about 7 at.% and increases gradually with distance from the boundary approaching the value typical of Ni 4 Mo at a distance of about 25 nm. It is noted that a similar result has been reported for Ni 4 Mo using the technique of three dimensional atom probe (3DAP) [24].…”

Section: Long-term Microstructural Stability Of the D1 A Superlatticesupporting

confidence: 78%

Correlation Between Microstructural Stability and Properties of Ground State Structures in Ordered Alloys: An Example Derived from the D1a Superlattice of Ni4Mo

Tawancy

2014

Metallogr. Microstruct. Anal.

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A study has been undertaken to determine the effect of microstructural stability on the properties of ground state crystal structure of Ni 4 Mo with D1 a superlattice. Thermal aging experiments have been carried out at 600, 700, and 800°C for up to 1,000 h and the corresponding effects on room temperature tensile properties and corrosion resistance in boiling 20% HCl have been determined. Details of the ordered microstructure have been characterized using x-ray diffraction, optical metallography, scanning electron microscopy, transmission electron microscopy combined with energy dispersive x-ray spectroscopy, and Auger electron spectroscopy. It is shown that the D1 a superlattice with nanoscale microstructure has a potentially useful combination of mechanical strength and corrosion resistance. However, changes in the microstructure of the D1 a superlattice resulting from spontaneous recrystallization after extended aging are found to have adverse effects on tensile ductility and corrosion resistance. This behavior has been correlated with formation of Mo-depleted zones alongside grain boundaries. Although first-principle calculations can accurately predict the ground state structures of many materials, the results of the study show that these methods are still in a stage where some application relevant properties of complex materials, such as the D1 a superlattice of Ni4Mo, cannot be predicted.

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“…Atomic-scale chemical analysis of the specimens was revealed using Local Electrode Atom Probe (LEAP) [17][18][19] . APT was conducted with 0.2 pulse fraction ratio and 200 kHz pulse repetition rate in 10 -8 Pa ultrahigh vacuum at 60 K.…”

Section: Methodsmentioning

confidence: 99%

Ultra-high cycle fatigue behavior of a novel 1.9 GPa grade super-high-strength maraging stainless steel

Liu

Zhao

et al. 2019

Materials Science and Engineering: A

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The mechanism of order-induced intrinsic embrittlement in a stoichiometric Ni4Mo alloy by TEM and 3DAP characterization

Cited by 6 publications

References 11 publications

Enhancing the Corrosion Resistance of Near-Stoichiometric Ni4Mo Alloy by Doping with Yttrium

Enhancing the Corrosion Resistance of Near-Stoichiometric Ni4Mo Alloy by Doping with Yttrium

Correlation Between Microstructural Stability and Properties of Ground State Structures in Ordered Alloys: An Example Derived from the D1a Superlattice of Ni4Mo

Ultra-high cycle fatigue behavior of a novel 1.9 GPa grade super-high-strength maraging stainless steel

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The mechanism of order-induced intrinsic embrittlement in a stoichiometric Ni4Mo alloy by TEM and 3DAP characterization

Cited by 6 publications

References 11 publications

Enhancing the Corrosion Resistance of Near-Stoichiometric Ni4Mo Alloy by Doping with Yttrium

Enhancing the Corrosion Resistance of Near-Stoichiometric Ni4Mo Alloy by Doping with Yttrium

Correlation Between Microstructural Stability and Properties of Ground State Structures in Ordered Alloys: An Example Derived from the D1a Superlattice of Ni4Mo

Ultra-high cycle fatigue behavior of a novel 1.9 GPa grade super-high-strength maraging stainless steel

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Ultra-high cycle fatigue behavior of a novel 1.9 GPa grade super-high-strength maraging stainless steel