Transformation of gamma to alpha manganese

Potter, E. Vernon; Lukens, H. C.; Huber, R. W.

doi:10.1007/bf03398111

Cited by 4 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They proposed that the phase (MnZn 3 ) could be divided into three phase regions (, 1 and 2 ), mainly based on the work of Wachtel and Tsiuplakis [15]. However, later and former experimental investigations on this system [16][17][18][19][20] showed no indication of phase separation. Recently, our research group confirmed the phase separation of the phase by means of a diffusion couple technique [21].…”

Section: Introductionmentioning

confidence: 98%

Experimental investigation on the phase equilibria of the Mn–Ni–Zn system at 400 °C

Liang

Liao

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 98%

Experimental investigation on the phase equilibria of the Mn–Ni–Zn system at 400 °C

Liang

Liao

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…The ductile metal was found to recrystallize to the brittle form at room temperature, the transformation being complete in about 14 days. 12 This phenomenon was ascribed to the high hydrogen content of electrolytic Mn. 13 The phase transition kinetics was investigated through the evolution of electrical resistivity with time.…”

mentioning

confidence: 99%

“…13 The phase transition kinetics was investigated through the evolution of electrical resistivity with time. 12 By using modern electrochemical techniques, more recent papers [14][15][16][17][18] examined the influence of processing conditions on manganese electrodeposition.…”

mentioning

confidence: 99%

Electrodeposition and Characterization of Manganese Coatings

Gong¹,

Zangari²

2002

J. Electrochem. Soc.

110

View full text Add to dashboard Cite

Manganese coatings of high quality are electrodeposited on steel substrates from simple sulfate solutions with addition of ammonium sulfate. Potentiodynamic scans and galvanostatic experiments are used to study manganese electrodeposition in a wide range of pH and current density. The effect of these variables on the microstructure, crystallography, mechanical, and corrosion-resistance properties of manganese deposits are investigated. It is found that ammonium sulfate enhances the reduction reaction of the manganese ion and provides a buffering effect. Two types of manganese deposits can be obtained depending on current density: crystalline films (type I, body-centered tetragonal γ-Mn) at low current density and amorphous films (type II) at high current density. Bright manganese films with (002) preferential orientation are electrodeposited at low pH. Type I structures show recrystallization at room temperature with phase transformation; the rate of phase transformation from γ-Mn to α-Mn (body-centered cubic) follows a Johnson-Mehl-Avrami kinetics. Crystalline films obtained at relatively high current density and low pH tend to have higher phase transformation rates. Amorphous films show good corrosion resistance both in acidic sodium sulfate/borate and sodium chloride electrolytes. © 2002 The Electrochemical Society. All rights reserved.

show abstract

“…They proposed the existence of three phase subdivisions (e, e 1 , and e 2 ) of the e phase (MnZn 3 ) mainly based on the work of Wachtel and Tsiuplakis. [19] However, the experimental investigations [20][21][22][23][24] published former and later on this system showed no indication of phase separation. In a recent experimental investigation of the Mn-Si-Zn system using diffusion couple techniques, one of the authors confirmed that the MnZn 3 region consisted of two subdivisions (e and e 1 ).…”

Section: Introductionmentioning

confidence: 96%

Determination of the Phase Equilibria in the Mn-Sn-Zn System at 500 °C

Liang

Zhao

et al. 2009

Metall Mater Trans A

View full text Add to dashboard Cite

The isothermal section of the Mn-Sn-Zn system at 500°C was determined with 20 alloys. The alloys were prepared by melting the pure elements in evacuated quartz capsules. The alloy samples were examined by means of X-ray diffraction (XRD) and scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy. A new ternary phase Mn 4 Zn 8 Sn (k) was found to have a bcc structure with a lattice parameter a = 0.92508 (5) nm. Its composition range spans 25 to 35 at. pct Mn, 4 to 8 at. pct Sn, and 55 to 70 at. pct Zn. The Zn is substituted for Mn in Mn 3 Sn, Mn 2 Sn, and Mn 3 Sn 2 . The solubility of Zn in Mn 3 Sn, Mn 2 Sn, and Mn 3 Sn 2 was measured to be about 17, 12, and 4 at. pct, respectively. The phase boundaries of the liquid and b-Mn phases were well established. The following 3 three-phase equilibria were well determined: (1) b-Mn + e-MnZn 3 + Mn 3 Sn, (2) k + Mn 3 Sn + Mn 2 Sn, and (3) L + k + Mn 2 Sn. The additional 5 three-phase equilibria, which are e-MnZn 3 + k + Mn 3 Sn, e 1 -MnZn 3 + e-MnZn 3 + k, e 1 -MnZn 3 + k + L, Mn 2 Sn + L + MnSn 2 , and Mn 3 Sn 2 + MnSn 2 + Mn 2 Sn, were deduced and shown with dashed lines in the present isothermal section.

show abstract

Transformation of gamma to alpha manganese

Cited by 4 publications

References 3 publications

Experimental investigation on the phase equilibria of the Mn–Ni–Zn system at 400 °C

Experimental investigation on the phase equilibria of the Mn–Ni–Zn system at 400 °C

Electrodeposition and Characterization of Manganese Coatings

Determination of the Phase Equilibria in the Mn-Sn-Zn System at 500 °C

Contact Info

Product

Resources

About