The effect of nitrogen on the glass-forming ability and micro-hardness of Fe–Cr–Mn–N amorphous alloys prepared by mechanical alloying

Salahinejad, E.; Amini, Rasool; Marasi, M.; Sritharan, Thirumany; Hadianfard, M.J.

doi:10.1016/j.matchemphys.2009.07.005

Cited by 28 publications

(38 citation statements)

References 23 publications

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“…Apart from this contribution, as noted in the experimental section, the stainless steel powders were synthesized by mechanical alloying, a process that induces nanocrystallization and amorphization. 27,28,29,30,31,32 During sintering, the shorter duration of the 30 min sample results in lower grain/crystal growth; and the smaller the grain/crystallite size the higher the corrosion rate and ion release rate. 33 albeit from the stainless steel matrix.…”

mentioning

confidence: 99%

Is cell viability always directly related to corrosion resistance of stainless steels?

Salahinejad

Ghaffari

Vashaee

et al. 2016

Materials Science and Engineering: C

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It has been frequently reported that cell viability on stainless steels is improved by increasing their corrosion resistance. The question that arises is whether human cell viability is always directly related to corrosion resistance in these biostable alloys. In this work, the microstructure and in vitro corrosion behavior of a new class of medical-grade stainless steels were correlated with adult human mesenchymal stem cell viability. The samples were produced by a powder metallurgy route, consisting of mechanical alloying and liquid-phase sintering with a sintering aid of a eutectic Mn-Si alloy at 1050 °C for 30 and 60 min, leading to nanostructures. In accordance with transmission electron microscopic studies, the additive particles for the sintering time of 30 min were not completely melted. Electrochemical impedance spectroscopic experiments suggested the higher corrosion resistance for the sample sintered for 60 min; however, a better cell viability on the surface of the less corrosion-resistant sample was unexpectedly found. This behavior is explained by considering the higher ion release rate of the Mn-Si additive material, as preferred sites to corrosion attack based on scanning electron microscopic observations, which is advantageous to the cells in vitro. In conclusion, cell viability is not always directly related to corrosion resistance in stainless steels. Typically, the introduction of biodegradable and biocompatible phases to biostable alloys, which are conventionally anticipated to be corrosion-resistant, can be advantageous to human cell responses similar to biodegradable metals.

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confidence: 99%

Is cell viability always directly related to corrosion resistance of stainless steels?

Salahinejad

Ghaffari

Vashaee

et al. 2016

Materials Science and Engineering: C

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“…This is explained from the points of view of the bonding configuration and electronic structure of the alloys. Owing to strong interatomic interactions between Fe-N, Cr-N, and Mn-N pairs [8,10,11], some electrons of the metallic bonds are transferred to the metal-nitrogen bonding regions. Because of the fact that N atoms possess a higher electronegativity than Fe, Cr, and Mn atoms, a strong accumulation of electrons forms near N atoms.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, noticeable researches on MA of stainless steels under a nitrogen atmosphere have been reported [8][9][10][11][12][13][14][15][16][17][18]. It has been recognized that nitrogen has a key contribution to amorphization in this alloy system.…”

Section: Introductionmentioning

confidence: 99%

“…It has been recognized that nitrogen has a key contribution to amorphization in this alloy system. In addition, aspects of phase transformations occurring during MA, thermal behavior, and magnetic properties of the Fe-Cr-Mn-N powders have been evaluated [8][9][10][11]. However, it seems that further researches are required to be conducted on other properties, particularly on their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and hardness evolution of mechanically alloyed Fe–Cr–Mn–N powders

Salahinejad

Amini

Bajestani

et al. 2010

Journal of Alloys and Compounds

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“…In spite of the suitable properties achieved through this method [4], broader application of chemical synthesis is also limited due to high precursor costs. Mechanical alloying (MA) is a solid state technique which is widely used to synthesize advanced materials such as intermetallic compounds and alloys [15], nanostructured materials, and supersaturated solid solutions [16][17][18]. The main advantage of the method is that solid-state reactions are activated via the introduction of mechanical energy instead of temperature.…”

Section: Introductionmentioning

confidence: 99%

Structural and phase evolution in mechanically alloyed calcium copper titanate dielectrics

Alizadeh

Ardakani

Amini

et al. 2013

Ceramics International

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Nanocrystalline calcium-copper-titanate (CCTO) dielectric powders were prepared by mechanical alloying. Phase transformations and structural evolution of the mechanically activated powders were investigated through the Rietveld refinement of the X-ray diffraction results. The crystallite size, lattice strain, and weight fraction of individual phases were estimated based on crystal structure refinement. Furthermore, the microstructural properties and thermal behavior of the milled powders were investigated by Transmission Electron Microscopy (TEM) and Differential Thermal Analysis (DTA), respectively. It was found that CCTO nanocrystals can be successfully synthesized after the amorphization of the initial crystalline materials. Semi-spherical nano-size particles were developed after sufficient milling time. Formation of an amorphous phase during the milling cycle was confirmed by the presence of the glass transition and crystallization peaks in the thermal analysis profiles.

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The effect of nitrogen on the glass-forming ability and micro-hardness of Fe–Cr–Mn–N amorphous alloys prepared by mechanical alloying

Cited by 28 publications

References 23 publications

Is cell viability always directly related to corrosion resistance of stainless steels?

Is cell viability always directly related to corrosion resistance of stainless steels?

Microstructural and hardness evolution of mechanically alloyed Fe–Cr–Mn–N powders

Structural and phase evolution in mechanically alloyed calcium copper titanate dielectrics

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