Ti Microalloying Effect on Corrosion Resistance and Thermal Stability of Cu45Zr48Al7 Bulk Metallic Glass

2012 ◽  
Vol 490-495 ◽  
pp. 3868-3873 ◽  
Author(s):  
Xiao Hong Yang ◽  
Xi Peng Nie ◽  
Jian Zhong Jiang
Keyword(s):  
Thermal Stability ◽  
Corrosion Resistance ◽  
Metallic Glasses ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Ti Addition ◽  
Mould Casting ◽  
Thermal Stability Of

Bulk metallic glasses (BMGs) of Cu45Zr48-xAl7Tix with x= 0, 1.5, and 3 at.% were prepared by copper mould casting. The corrosion resistance of the BMGs with different Ti contents was examined by potentiodynamic polarization tests and weight loss measurements in 1 N NaOH, 1 N H2SO4, 1 N H2SO4 + 0.01 N NaCl and 0.5 N NaCl solutions, respectively. The newly-developed BMGs’ corrosion resistance in Cl-- or both H+ and Cl--ions containing solutions can be greatly enhanced. The influence of Ti addition on glass forming ability (GFA) and thermal stability was investigated by x-ray diffraction and differential scanning calorimetry in detail. The alloy containing 1.5 at.% Ti exhibits the largest GFA, the critical size comes up to 10 mm in diameter.

scholarly journals Characterization of the Interface Between the Bulk Glass Forming Alloy Zr41Ti14Cu12Ni10Be23 with Pure Metals and Ceramics

2000 ◽  
Vol 15 (7) ◽  
pp. 1617-1621 ◽  
Author(s):  
Jan Schroers ◽  
Konrad Samwer ◽  
Frigyes Szuecs ◽  
William L. Johnson
Keyword(s):  
Sessile Drop ◽  
Bulk Glass ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glass Forming ◽  
Processing Times ◽  
Thermal Stability Of

The reaction of the bulk glass forming alloy Zr41Ti14Cu12Ni10Be23 (Vit 1) with W, Ta, Mo, AlN, Al2O3, Si, graphite, and amorphous carbon was investigated. Vit 1 samples were melted and subsequently solidified after different processing times on discs of the different materials. Sessile drop examinations of the macroscopic wetting of Vit 1 on the discs as a function of temperature were carried out in situ with a digital optical camera. The reactions at the interfaces between the Vit 1 sample and the different disc materials were investigated with an electron microprobe. The structure and thermal stability of the processed Vit 1 samples were examined by x-ray diffraction and differential scanning calorimetry. The results are discussed in terms of possible applications for composite materials.

Polypseudorotaxane Hydrogels Based on F127 Block-Selected Inclusion Complexation with α-Cyclodextrin

2012 ◽  
Vol 482-484 ◽  
pp. 1898-1903
Author(s):  
Ying Xue Zhou ◽  
Xiao Dong Fan ◽  
Dan Xue
Keyword(s):  
Thermal Stability ◽  
Inclusion Complex ◽  
Inclusion Complexation ◽  
Wide Angle ◽  
Acryloyl Chloride ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Thermal Stability Of ◽  
Channel Type

Supramolecular hydrogels were formed through F127, acryloyl chloride modified F127 inclusion complex with α-cyclodextrin, respectively. The structure of modified copolymers and inclusion complex was characterized by Fourier transform infrared spectroscopy (FTIR) and hydrogen nuclear magnetic resonance (1H-NMR). Hydrogels formed from supramolecular inclusion are imparted channel-type structure investigated by wide angle x-ray diffraction (WAXRD). Differential scanning calorimetry (DSC) and TG experiments showed that thermal stability of hydrogels depend on the nature of axis polymer. The relative model was proposed to elucidate the inclusion complexes and hydrogels formation.

Glass-Forming Ability and Thermal Stability of Gd55-xNdxCo20Al25 Metallic Glass

2013 ◽  
Vol 538 ◽  
pp. 270-273
Author(s):  
Li Li Zhang ◽  
Qi Jun Huang ◽  
Zhi Qin Liao ◽  
Feng Xu ◽  
Guang Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Amorphous Ribbon ◽  
Glass Forming Ability ◽  
X Ray Diffraction ◽  
Glass Transition Temperatures ◽  
X Ray ◽  
Glass Forming ◽  
Nd Substitution ◽  
Change Of Microstructure ◽  
Thermal Stability Of

The effects of Nd substitution in Gd55-xNdxCo20Al25 (x=0, 5, 10, 15 and 20) amorphous ribbon samples on glass-forming ability and thermal stability are studied. The change of microstructure cannot be identified by X-ray diffraction. The forecast of glass-forming ability following Fang’s method shows the increase with x, which is further confirmed experimentally by the increasing reduced glass-transition temperatures. The thermal stability has a minimum at x=10, and it is suggested to be due to the different effects of the reducing of Gd and the increase of Nd.

Preparation and Thermal Stability of Pyrrole and m-Toluidine Copolymer/Montmorillonite Composites

2014 ◽  
Vol 915-916 ◽  
pp. 780-783
Author(s):  
Hong Wang ◽  
Ming Tian Li ◽  
Yue Lu ◽  
Di Liu
Keyword(s):  
Thermal Stability ◽  
Interfacial Interaction ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Chemical Polymerization ◽  
X Ray ◽  
Ft Ir ◽  
Clay Layers ◽  
Thermal Stability Of

Pyrrole and m-toluidine copolymer (P(PY/MT)) / montmorillonite (MMT) Composites were prepared by in situ chemical polymerization of pyrrole with m-toluidine monomer in the presence of montmorillonite. The structural, morphological and thermal properties of these composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). X-ray diffraction result for P(PY/MT)-MMT illuminated the intercalation of P(PY/MT) copolymer between the clay layers. The FT-IR result showed the successful incorporation of montmorillonite clay in the prepared P(PY/MT)/MMT composite. The higher thermal stability of high MMT content rate might be attributed to its higher chain compactness due to the interfacial interaction between the P(PY/MT) and the clay.

scholarly journals Glass Formation Range of Mg-Based Bulk Metallic Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 2018-2025 ◽  
Author(s):  
Jean Louis Soubeyroux ◽  
Stéphane Gorsse ◽  
G. Orveillon
Keyword(s):  
Metallic Glasses ◽  
Composition Range ◽  
Driving Forces ◽  
Critical Diameter ◽  
Ternary Systems ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Forming ◽  
Mould Casting ◽  
Formation Range

New bulk metallic glasses (BMG) have been synthesized in the Mg-Cu-RE systems (RE= Y, Gd) with high critical diameter. In order to determine the glass forming range of these ternary systems, the calculation of the onset of driving forces (ODF) has been performed and has shown a large composition range for BMG formation. The synthesis of particular compositions in this domain has shown that all the produced alloys present a high glass forming ability (GFA) measured by DSC experiments. The ODF model, synthesized alloys by mould casting, characterization by X-ray diffraction and DSC techniques are presented.

scholarly journals Effect of Transition Elements on the Thermal Stability of Glassy Alloys 82Al–16Fe–2TM (TM: Ti, Ni, Cu) Prepared by Mechanical Alloying

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3978
Author(s):  
Nguyen Thi Hoang Oanh ◽  
Do Nam Binh ◽  
Dung Dang Duc ◽  
Quyen Hoang Thi Ngoc ◽  
Nguyen Hoang Viet
Keyword(s):  
Thermal Stability ◽  
Crystallization Process ◽  
Amorphous Matrix ◽  
Intermetallic Phases ◽  
Transition Elements ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Glassy Alloys ◽  
Thermal Stability Of

In the present study, the thermal stability and crystallization behavior of mechanical alloyed metallic glassy Al82Fe16Ti2, Al82Fe16Ni2, and Al82Fe16Cu2 were investigated. The microstructure of the milled powders was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results showed remarkable distinction in thermal stability of the alloys by varying only two atomic percentages of transition elements. Among them, Al82Fe16Ti2 alloy shows the highest thermal stability compared to the others. In the crystallization process, exothermal peaks corresponding to precipitation of fcc-Al and intermetallic phases from amorphous matrix were observed.

Effects of Cu and Zr on the Formation and Thermal Stability of Al–Ni–Zr–Cu–Y Amorphous Alloy

2012 ◽  
Vol 271-272 ◽  
pp. 36-41
Author(s):  
Wei Yuan Yu ◽  
Wen Jiang Lu ◽  
Nai Rui Li
Keyword(s):  
Thermal Stability ◽  
Amorphous Alloy ◽  
Amorphous Alloys ◽  
Melt Spinning ◽  
Glass Forming Ability ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Glass Forming ◽  
Spinning Process ◽  
Thermal Stability Of

Al85Ni10Zr3Y2 and Al80Ni10Zr8-xCuxY2（x=1,2,3,5） alloy ribbons had been prepared by single roller melt-spinning process under vacuum conditions. The ribbons were investigated by X–ray diffraction and differential scanning calorimetry (DSC). The results revealed the strong effect of content of Cu、Zr elements on the glass forming ability and the thermal stability of the alloys. The formation of amorphous alloys are sensitive to contens of these two elements. The completely amorphous alloy or the primary amorphous phase alloy can be obtained when the content of Cu or Zr reach an optimization, otherwise only gaining crystal phase. Al80Ni10Zr7Cu1Y2 and Al80Ni10Zr3Cu5Y2 alloys possess the excellent glass forming ability, which can form the completely amorphous alloy or the composite material of the partial crystal in remaining amorphous.

Preparation of Poly(m-toluidine)/Montmorillonite Composites and its Thermal Stability

2014 ◽  
Vol 941-944 ◽  
pp. 334-337
Author(s):  
Hong Wang ◽  
Rui Song Yang ◽  
Ying Wang
Keyword(s):  
Thermal Stability ◽  
Interfacial Interaction ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Chemical Polymerization ◽  
X Ray ◽  
Ft Ir ◽  
Clay Layers ◽  
Thermal Stability Of

Poly (m-toluidine)(PMT) / montmorillonite (MMT) Composites with thermal stability were synthesized by in situ chemical polymerization of m-toluidine monomer in the presence of montmorillonite. The PMT /MMT composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The FT-IR result displayed the successful incorporation of montmorillonite clay in the prepared PMT/MMT composite. X-ray diffraction result for PMT/MMT showed the intercalation of PMT between the clay layers. The higher thermal stability of high MMT content rate might be attributed to its higher chain compactness due to the interfacial interaction between the PMT and the .MMT.

Role of gadolinium(III) complex in improving thermal stability of polythiophene composite

2015 ◽  
Vol 69 (10) ◽  
Author(s):  
Ferooze Ahmad Rafiqi ◽  
Kowsar Majid
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Average Particle Size ◽  
Degree Of Crystallinity ◽  
Average Particle ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Thermal Stability Of

AbstractThis paper involves the preparation of polythiophene (PTP) and its composite by the oxidative polymerisation method by using ferric chloride as an oxidant and thiophene monomer. The gadolinium( III) complex obtained by the refluxing technique was used as dopant in the PTP matrix. On the basis of the spectroscopic characterisation, seven-coordinate geometry is proposed for the complex. Conductance measurement confirms the non-selectrolyte nature of complex. The PTP and its composite were subjected to FTIR, X-ray diffraction and scanning electron microscope techniques. The powder X-ray diffraction pattern showed the high crystalline nature of the complex which in turn developed a good degree of crystallinity in the PTP composite. The average particle size was calculated as 4.655 ˚A and 3.737 ˚A for the dopant and PTP composite, respectively, by using Debye Scherrer’s equation. Thermal analysis was performed by thermogravimetric (TG) analysis, differential thermal analysis (DTA) and differential scanning calorimetry (DSC) techniques. The TG, DTA and DSC results were well-correlated. The thermal analysis revealed the high thermal stability of the dopant which in turn improved the thermal stability of the PTP composite, revealing the potential of the composite for high temperature applications.

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