Boriding of Binary Ni–Ti Shape Memory Alloys

2016 ◽  
Vol 71 (11) ◽  
pp. 1017-1020
Author(s):  
Nazim Ucar ◽  
Sule Dogan ◽  
Mustafa Serdar Karakas ◽  
Adnan Calik
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Solid Medium ◽  
High Hardness ◽  
Boride Layer ◽  
Growth Rate Constant ◽  
X Ray Diffraction ◽  
X Ray ◽  
Parabolic Relationship

AbstractBoriding of binary Ni–Ti shape memory alloys was carried out in a solid medium at 1273 K for 2, 4, 6, and 8 h using the powder pack method with proprietary Ekabor–Ni powders. Characterization of the boride layer formed on the surface of alloys was done by optical microscopy and scanning electron microscopy. The presence of boride, silicide, and borosilicide phases in the boride layers was confirmed by X-ray diffraction analysis. The thickness and microhardness of the boride layers increased with increasing boriding time. Hardness profiles showed a rapid decrease in hardness moving from the boride layer to the main structure. The high hardness of the boride layer was attributed mainly to the formation of TiB2. A parabolic relationship was observed between layer thickness and boriding time, and the growth rate constant for the boriding treatment was calculated as 0.62×10−8 cm2 s−1.

Formation of boride layers on a commercially pure Ti surface produced via powder metallurgy

2021 ◽  
Vol 112 (4) ◽  
pp. 303-307
Author(s):  
Yavuz Kaplan ◽  
Mehmet Gülsün ◽  
Sinan Aksöz
Keyword(s):  
Powder Metallurgy ◽  
Substrate Surface ◽  
High Hardness ◽  
Titanium Boride ◽  
Boride Layer ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Commercially Pure ◽  
Boriding Process

Abstract In this study, powder metallurgy was applied in a furnace atmosphere to form titanium boride layers on a commercially pure Ti surface. Experiments were carried out using the solid-state boriding method at 900 °C and 1000°C for 12 h and 24 h. Samples were produced by pressing the commercially pure Ti powders under 870 MPa. The sintering process required by the powder metallurgy method was carried out simultaneously with the boriding process. Thus, the sintering and boriding were performed in one stage. The formation of the boride layer was investigated by field emission scanning electron microscopy, optical-light microscopy, X-ray diffraction, and elemental dispersion spectrometry analyses. In addition, microhardness measurements were performed to examine the effect of the boriding process on hardness. The Vickers microhardness of the boronized surface reached 1773 HV, which was much higher than the 150 HV hardness of the commercially pure Ti substrate. The X-ray diffraction analysis showed that the boriding process had enabled the formation of TiB and TiB2 on the powder metallurgy Ti substrate surface. Consequently, the production of Ti via powder metallurgy is a potentially cost-effective alternative to the conventional method, and the boriding process supplies TiB and TiB2 that provide super-high hardness and excellent wear and corrosion resistance.

Properties of Boride Layer on Boridesae 1035 Steel by Molten Salt

2013 ◽  
Vol 467 ◽  
pp. 116-121 ◽  
Author(s):  
Alaeddine Kaouka ◽  
Omar Allaoui ◽  
Mourad Keddam
Keyword(s):  
Layer Thickness ◽  
Steel Substrate ◽  
Kinetic Studies ◽  
Salt Bath ◽  
Boride Layer ◽  
Process Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Parabolic Relationship ◽  
Borided Steel

Properties of borided SAE 1035 steel have been investigated during boriding treatment, which was carried out in slurry salt bath at temperature range from1073 to 1273K for 2, 4 and 8 h. The presence of both FeB and Fe2B phases formed on the surface of steel substrate was confirmed by X-ray diffraction. Scanning electron microscopy (SEM) and optical microscopy examinations showed that boride layers have saw-tooth and columnar morphology. It has been shown that the thickness of boride layers increased when the time and temperature process increased, its value ranged from 20 to 387 μm. The hardness value of the boride layer was about 1760±200 HV0.1, while the hardness of un-borided steel was about 225±20 HV0.1. The kinetic studies showed a parabolic relationship between layer thickness and process time. Depending on temperature and layer thickness.

Characterization of Cordierite Glass with the Addition Colorant Ceramic Glaze for FIR Therapy

2016 ◽  
Vol 840 ◽  
pp. 207-212
Author(s):  
Lim Yi Xuan ◽  
Johar Banjuraizah ◽  
Zainal Arifin Ahmad
Keyword(s):  
High Hardness ◽  
Structural Refinement ◽  
X Ray Diffraction ◽  
Porosity Level ◽  
X Ray ◽  
Refinement Method ◽  
Cordierite Glass ◽  
Crystallization Of Glass ◽  
Rietveld Structural Refinement

α-Cordierite glass ceramic was synthesised through crystallization of glass compacts made of milled glass frits. The effect of temperatures and colorants were studied. The crystal structure of α-cordierite was analysed using X-ray diffraction technique and Rietveld structural refinement method. Density, porosity and shrinkage analysis, Vickers hardness and SEM were also performed. The result revealed that at higher sintering temperatures, the properties of α-cordierite was getting better. Low apparent porosity level and high hardness dense α-cordierite was fabricated at temperature 1350oC. The low porosity level may lead to high thermal conductivity which suggested that cordierite was candidates for FIR therapy instrumemts.________________________________________________________________________

Shape Recovery and ε - γ Transformation in Fe29Mn7Si5Cr SMA

2008 ◽  
Vol 59 ◽  
pp. 86-91 ◽  
Author(s):  
Nele Van Caenegem ◽  
Kim Verbeken ◽  
Roumen H. Petrov ◽  
N.M. van der Pers ◽  
Yvan Houbaert
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Shape Recovery ◽  
Electron Backscatter Diffraction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Backscatter ◽  
Shape Memory Behaviour ◽  
Backscatter Diffraction

The shape memory behaviour of a Fe29Mn7Si5Cr based alloy has been investigated. Characterization of the martensitic transformation and the different structural constituents was performed using optical microscopy, X-ray diffraction (XRD) methods and electron backscatter diffraction (EBSD). The transformation temperatures and the shape recovery were determined by dilatometry on prestrained samples.

Study of Surface Hardening to Injectors of Gasoline

2012 ◽  
Vol 538-541 ◽  
pp. 239-242 ◽  
Author(s):  
Noe López-Perrusquia ◽  
Marco Antonio Doñu-Ruíz ◽  
J.V. Cortes-Suarez ◽  
L. D. Rosado-Cruz ◽  
David Sanchez-Huitron
Keyword(s):  
Surface Treatment ◽  
Surface Hardening ◽  
Boride Layer ◽  
Fuel Injector ◽  
X Ray Diffraction ◽  
Aisi 304 ◽  
X Ray ◽  
Type Layer ◽  
Useful Life

This paper studies the formation of boride layers on substrate injector combustion AISI 304 per nozzle surface treatment in addition the formation of hard layers and FeB type Fe2B were obtained in a temperature range of 1223 and 1273 K with exposure times of 1/2, 1, 3 and 5 h. The study consisted boride type layer formed on the surface and the characterization of the boride layer were evaluated by the method by analysis of X-ray diffraction (XRD), the distribution of the alloying elements were detected by spectrometry energy Dispersive (EDS) inside the surface, the evaluation of adhesion of the layers was determined by the technique Rockwell-C hardness was also evaluated and the Young's modulus of the layer by the nanoindentation technique with the load of 200 mN. Finally this study hardening fuel injector; is desired increase its useful life.

Microstructural Characterization of Solid State Reaction Phase Formed During Sintering of Hexagonal Boron Nitride with Iron

2017 ◽  
Vol 23 (5) ◽  
pp. 1061-1066 ◽  
Author(s):  
Kaline P. Furlan ◽  
Deise R. Consoni ◽  
Breno Leite ◽  
Matheus V. G. Dias ◽  
Aloisio N. Klein
Keyword(s):  
Solid Lubricant ◽  
Hexagonal Boron Nitride ◽  
High Hardness ◽  
Microstructural Characterization ◽  
Correct Selection ◽  
X Ray Diffraction ◽  
Reaction Phase ◽  
X Ray ◽  
Selection Of

AbstractIn the development of dry self-lubricating composites, not only solid lubricant particle size and distribution are important, but also the correct selection of the solid lubricant characteristics, which should be stable, i.e. not reactive, during the whole processing. In this work, Fe+9 vol% h-BN composites were produced by uniaxial cold compaction and sintering, for which a reaction between h-BN and iron was detected after sintering at 1,150°C. The reaction phase was characterized by optical and scanning electron microscopy and identified by X-ray diffraction and energy-dispersive X-ray spectroscopy. The newly formed phase had high hardness when compared with the iron matrix. The resulting composites presented a high friction coefficient and high wear.

The Stress Relaxation Characteristic and Martensitic Transformation of Fe-Mn-Si Shape Memory Alloys under Different Deformation Condition

2012 ◽  
Vol 430-432 ◽  
pp. 106-109
Author(s):  
Lin Lin Liu ◽  
Cheng Xin Lin ◽  
Chao Yu Zhou
Keyword(s):  
Martensitic Transformation ◽  
Stress Relaxation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Xrd Analysis ◽  
Deformation Condition ◽  
X Ray Diffraction ◽  
X Ray

The stress relaxation characteristic and martensitic transformation in Fe-Mn-Si shape memory alloys under different deformation condition are studied by X-Ray Diffraction (XRD) analysis and TEM observation. The results show that the amount of stress induced ε martensitic quickly increases when the suspending loading time below 10min (0~10min), and the increasing speed of ε martensitic gradually become slower when the suspending loading time above 10min. This is owing to the stabilization of stress induced ε martensitic. The stress relaxation ratio of Fe-17Mn-5Si-10Cr-5Ni and Fe-17Mn-5Si-2Cr-2Ni-1V alloys increase with increasing the suspending loading time, and the relaxation ratio of Fe-17Mn-5Si-2Cr-2Ni-1V alloy is obviously lower than that of Fe-17Mn-5Si-10Cr-5Ni alloy.

scholarly journals X-ray Diffraction Analysis of Ti-18 mol%Nb Based Shape Memory Alloys Containing 3d Transition Metal Elements

2006 ◽  
Vol 47 (4) ◽  
pp. 1209-1213 ◽  
Author(s):  
Yosuke Horiuchi ◽  
Tomonari Inamura ◽  
Hee Young Kim ◽  
Syuichi Miyazaki ◽  
Kenji Wakashima ◽  
...  
Keyword(s):  
Transition Metal ◽  
Shape Memory Alloys ◽  
Diffraction Analysis ◽  
Shape Memory ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Elements ◽  
Transition Metal Elements
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