High-B/sub s/ low-H/sub c/ CoNiFe films with bcc single-phase structure for write heads

2002 ◽  
Vol 38 (5) ◽  
pp. 2256-2258 ◽  
Author(s):  
Y. Okada ◽  
K. Kudo ◽  
N. Yoshida ◽  
M. Fuyama ◽  
H. Hoshiya
Keyword(s):  
Phase Structure ◽  
Single Phase ◽  
Write Heads

CHARACTERIZATION OF NANOCRYSTALLINE NICKEL–COBALT ALLOYS SYNTHESIZED BY DIRECT AND PULSE ELECTRODEPOSITION

2014 ◽  
Vol 28 (06) ◽  
pp. 1450043 ◽  
Author(s):  
M. SALEHI ◽  
A. SAIDI ◽  
M. AHMADIAN ◽  
K. RAEISSI
Keyword(s):  
Phase Structure ◽  
Single Phase ◽  
Nickel Sulfate ◽  
Cobalt Sulfate ◽  
Xrd Pattern ◽  
Ph Values ◽  
Nickel Cobalt ◽  
Co Alloys ◽  
Electrolyte Ph

Nanocrystalline Ni – Co alloys are electrodeposited by direct (DC) and pulse current (PC) in an electrolyte solution which consisted of nickel sulfate, cobalt sulfate and boric acid. Electrodeposition parameters including current density, electrolyte pH and pulse times in a single electrolyte bath were changed. XRD pattern showed that the structure of the alloys depends on Co content and the synthesis parameter and changed from single phase structure (fcc) to dual phase structure (fcc + hcp). The Co content in the deposited alloys declined from 70 at.% to 50 at.% by increasing in direct current from 70 mA/cm2 to 115 mA/cm2 and also decreased from 75 at.% to 33 at.% with decrease in pH values from 4 to 2. By applying PC the Co content changed from 76 at.% to 41 at.%. Magnetic properties measurements showed the saturation magnetization (Ms) increased with increasing the Co content. There was no significant effect on coercivity values (Hc) with change in Co content and about 40 Oe was obtained for all samples. The grain size of deposited alloys obtained between 24–58 nm and 15–21 nm by applying DC and PC, respectively.

Structure and Properties of Electrolytic Zn-Mn Coatings Deposited by the Galvanostatic Method

2013 ◽  
Vol 203-204 ◽  
pp. 216-219
Author(s):  
Magdalena Popczyk ◽  
Katarzyna Wykpis ◽  
Bożena Bierska-Piech
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Chemical Composition ◽  
Surface Morphology ◽  
Phase Structure ◽  
Single Phase ◽  
Structure And Properties ◽  
Protective Properties ◽  
Galvanostatic Method ◽  
Galvanostatic Conditions

The Zn-Mn coatings were deposited under galvanostatic conditions from a sulfate galvanic bath. The influence of thiocarbamide additions in the bath on surface morphology, chemical and phase composition and corrosion resistance of the electrolytic Zn-Mn coatings was investigated. On the basis of these investigations it was found that Zn-Mn coatings can be obtained by the galvanostatic method. Morphology and chemical composition of the electrolytic Zn-Mn coatings depend on the thiocarbamide concentration in the galvanic bath. XRD investigations of obtained coatings showed a single phase structure (α-Mn1.08Zn2.92). The additions of thiocarbamide improve the protective properties of the Zn-Mn coatings.

LiMn2O4 Prepared by a Flameless Solution Combustion Synthesis: The Effect of Ignition Temperature

2011 ◽  
Vol 142 ◽  
pp. 213-216
Author(s):  
Gui Yang Liu ◽  
Jun Ming Guo ◽  
Yan Nan Li ◽  
Bao Sen Wang ◽  
Ying He
Keyword(s):  
Electrochemical Performance ◽  
Combustion Synthesis ◽  
Phase Structure ◽  
Ignition Temperature ◽  
Present Method ◽  
Single Phase ◽  
Raw Materials ◽  
Solution Combustion Synthesis ◽  
Solution Combustion ◽  
Micro Morphology

Spinel LiMn2O4 have been prepared by a flameless solution combustion synthesis, using nitrate and acetate salts as raw materials without any fuels. The effect of ignition temperature on the phase structure, micro morphology and electrochemical performance has been studied. The results indicate that spinel LiMn2O4 with single phase can be prepared successfully by the present method at the ignition temperatures of 300-800°C and calcination temperature of 600°C for 5h. The crystallinity, dispersity of the gains and electrochemical performance of the products increase with the decreasing ignition temperatures.

scholarly journals Analysis of welding kind impact upon phase structure and inner stresses of austenitic and duplex steel welded joints

2020 ◽  
Vol 2020 (3) ◽  
pp. 3-11
Author(s):  
Sergey Kuryntsev
Keyword(s):  
Thermal Treatment ◽  
Welded Joints ◽  
Phase Structure ◽  
High Performance ◽  
Single Phase ◽  
Negative Impact ◽  
Two Phase ◽  
Duplex Steel ◽  
High Cooling Rates ◽  
The Impact

A literature review and own investigations of the impact of a welding kind and post-welding thermal treatment upon a phase structure and residual stresses of welded joints are carried out. It is defined that such high-performance and promising welding kinds as electronic-beam welding (EBW) and laser welding (LW) have a negative impact upon a phase structure of two-phase (duplex) and single-phase steels as a result of high cooling rates of welded joints.

Microstructures in rapidly solidified Ni4Mo alloy

1991 ◽  
Vol 49 ◽  
pp. 602-603
Author(s):  
Siqi Cao
Keyword(s):  
Melting Point ◽  
Rapid Solidification ◽  
Long Range ◽  
Phase Structure ◽  
Short Range ◽  
Single Phase ◽  
Water Quenching ◽  
Disorder Transition ◽  
Fee Structure ◽  
Rapidly Solidified

The alloy of Ni-20 at pet Mo has a single phase structure with an order-disorder transition at 868°C. A short-range ordered fee structure (α) exists above 868°c, which shows a diffuse (1,1/2,0) diffraction feature. The intensity of the (1,1/2,0) diffraction becomes weak as the temperature increases, but may exist to the melting point. Below 868°C, long-range ordered bet structure (β) occurs by rearrangement of atoms from a. The short-range ordered a can be retained by water quenching from above 868°C. The purpose of this paper is to determine the effect of rapid solidification on the microstructures and the suppression of ordering.

An Electrochemical Method for the Preparation of Al-Mg Master Alloys from MgO

2010 ◽  
Vol 650 ◽  
pp. 260-264 ◽  
Author(s):  
Da Li Cao ◽  
Ji Kun Wang ◽  
Si Chen Guo ◽  
Qin Hong Fang ◽  
Zhong Ning Shi
Keyword(s):  
Formation Mechanism ◽  
Master Alloy ◽  
Phase Structure ◽  
Electrochemical Method ◽  
Single Phase ◽  
Cell Voltage ◽  
Electrolysis Time ◽  
Electrolysis Process ◽  
Master Alloys ◽  
Mg Content

The electrochemical formation of Al-Mg master alloys were investigated in NaCl-MgF2-MgO melt at 850°C. The results revealed that cell voltage was nearly constant during electrolysis process, Mg content in Al-Mg master alloys increased with increasing of electrolysis time when Mg content was less 7.03mass%, Mg content in Al-Mg master alloys can be up to 7.03mass% for 4h electrolysis. The results of XRD indicated that phase structure of the Al-7.03Mg mass% alloy existed single phase α-Al, MgCl2 and NaMgF3 in electrolyte were observed after electrolysis. And the formation mechanism of Al-Mg master alloy was discussed as well.

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