Microstructural evolution of spinodally formed Fe35Ni15Mn25Al25

Baker, I.; Zheng, Rongkun; Saxey, David W.; Kuwano, S.; Wittmann, Markus; Loudis, J. A.; Prasad, Kartik; Liu, Zongwen; Marceau, Ross K. W.; Munroe, Paul; Ringer, Simon P.

doi:10.1016/j.intermet.2009.03.016

Cited by 28 publications

(7 citation statements)

References 37 publications

(91 reference statements)

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“…The spinodal wavelength () is a critical parameter for evaluating mechanical properties (28,31). We systematically studied the evolution of spinodal decomposition wavelength using a combination of synchrotron XRD experiments and phase-field simulation (PFS).…”

Section: Morphological Evolution Of the Spinodalmentioning

confidence: 99%

Ultrahigh specific strength in a magnesium alloy strengthened by spinodal decomposition

et al. 2021

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Strengthening of magnesium (Mg) is known to occur through dislocation accumulation, grain refinement, deformation twinning, and texture control or dislocation pinning by solute atoms or nano-sized precipitates. These modes generate yield strengths comparable to other engineering alloys such as certain grades of aluminum but below that of high-strength aluminum and titanium alloys and steels. Here, we report a spinodal strengthened ultralightweight Mg alloy with specific yield strengths surpassing almost every other engineering alloy. We provide compelling morphological, chemical, structural, and thermodynamic evidence for the spinodal decomposition and show that the lattice mismatch at the diffuse transition region between the spinodal zones and matrix is the dominating factor for enhancing yield strength in this class of alloy.

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Section: Morphological Evolution Of the Spinodalmentioning

confidence: 99%

Ultrahigh specific strength in a magnesium alloy strengthened by spinodal decomposition

et al. 2021

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“…For systems with an elastic anisotropy, the direction of the concentration waves during spinodal decomposition will be along the elastically softer directions. A majority of metals have Az>1 and thus a microstructure consisting of concentration waves in the <100> directions are most common after spinodal decomposition, see for example Baker et al [80].…”

Section: Anisotropic Effects On the Microstructurementioning

confidence: 99%

Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures

Norrby¹

2014

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LINKÖPING 2014The cover image shows nine two-dimensional x-ray diffractograms of TiAlN merged into one quarter circle. Going counterclockwise from an as-deposited sample, the parts show different stages of annealing. The color scheme is chosen to represent the motto "Stort hjärta, hårt arbete".Niklas Norrby, unless otherwise stated ISBN: 978-91-7519-372-4 ISSN: 0345-7524 Printed by LiU-Tryck, Linköping, Sweden, 2014 i Abstract A typical hard coating on metal cutting inserts used in for example turning, milling or drilling operations is TiAlN. At elevated temperatures, TiAlN exhibits a well characterized spinodal decomposition into coherent cubic TiN and AlN rich domains, which is followed by a transformation from cubic to hexagonal AlN. Using in-situ synchrotron x-ray radiation, the kinetics of the second transformation was investigated in this thesis and the strong temperature dependence on the transformation rate indicated a diffusion based nucleation and growth mechanism. The results gave additional information regarding activation energy of the transformation and the critical wavelength of the cubic domains at the onset of hexagonal AlN. After nucleation and growth, the hexagonal domains showed a striking resemblance with the preexisting cubic AlN microstructure.During metal cutting, the tool protecting coating is subjected to temperatures of ~900 ºC and pressure levels in the GPa range. The results in this thesis have shown a twofold effect of the pressure on the decomposition steps. Firstly, the spinodal decomposition was promoted by the applied pressure during metal cutting which was shown by comparisons with annealed samples at similar temperatures. Secondly, the detrimental transformation from cubic to hexagonal AlN was shown to be suppressed at elevated hydrostatic pressures. A theoretical pressure/temperature phase diagram, validated with experimental results, also showed suppression of hexagonal AlN by an increased temperature at elevated pressures.The spinodal decomposition during annealing and metal cutting was in this work also shown to be strongly affected by the elastic anisotropy of TiAlN, where the phase separation was aligned along the elastically softer <100> directions in the crystal. The presence of the anisotropic microstructure enhanced the mechanical properties compared to the isotropic case, mainly due to a shorter distance between the c-AlN and c-TiN domains in the anisotropic case. Further improvement of the metal cutting behavior ii was realized by depositing individual layers with an alternating bias. The individual bias layers exhibited microstructural differences with different residual stress states. The results of the metal cutting tests showed an enhanced wear resistance in terms of both crater and flank wear compared to coatings deposited with a fixed bias.iii Populärvetenskaplig sammanfattningI den här avhandlingen presenteras forskningsresultat på en keramisk beläggning, TiAlN (titanaluminiumnitrid), som ligger som ett skyddande skikt på svarvskär. Tjockleken på beläggni...

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“…As the Al or Mn content decreases from the stoichiometric composition, the B2/L2 1 transition temperature also decreases slightly. In an Fe-25Mn-15Ni-25Al alloy, Baker et al [15] reported spinodal decomposition of a Fe/Mn-rich BCC phase and a Ni/Al-rich B2 phase during annealing at 550°C. However, they also found the evidence of L2 1 structure in the annealed and air-cooled specimen at 550°C.…”

Section: Precipitation Of B2 Ni 2 Mnal Phase In Fe-mn-ni-al Alloysmentioning

confidence: 99%

Precipitation and fracture behaviour of Fe–Mn–Ni–Al alloys

Heo

Lee

2013

Philosophical Magazine

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The effects of Al addition on the precipitation and fracture behaviour of Fe-Mn-Ni alloys were investigated. With the increasing of Al concentration, the matrix and grain boundary precipitates changed from L1 0 h-MnNi to B2 Ni 2 MnAl phase, which is coherent and in cube-to-cube orientation relationship with the α′-matrix. Due to the suppression of the h-MnNi precipitates at prior austenite grain boundaries (PAGBs), the fracture mode changed from intergranular to transgranular cleavage fracture. Further addition of Al resulted in the discontinuous growth of Ni 2 MnAl precipitates in the alloy containing 4.2 wt.% Al and fracture occurred by void growth and coalescence, i.e. by ductile dimple rupture. The transition of the fracture behaviour of the Fe-MnNi-Al alloys is discussed in relation to the conversion of the precipitates and their discontinuous precipitation behaviour at PAGBs.

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Microstructural evolution of spinodally formed Fe35Ni15Mn25Al25

Cited by 28 publications

References 37 publications

Ultrahigh specific strength in a magnesium alloy strengthened by spinodal decomposition

Ultrahigh specific strength in a magnesium alloy strengthened by spinodal decomposition

Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures

Precipitation and fracture behaviour of Fe–Mn–Ni–Al alloys

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