Effects of Y Alloying on Thermal Stability and Corrosion Resistance of Cu-Zr-Al Metallic Glass

2013 ◽  
Vol 850-851 ◽  
pp. 62-65
Author(s):  
Yi Liu ◽  
Yan Fang Wang ◽  
Li Jun Xiao ◽  
Ming Xing Liu ◽  
Zhi Qiang Shi
Keyword(s):  
Thermal Stability ◽  
Corrosion Resistance ◽  
Base Alloy ◽  
Amorphous State ◽  
Corrosion Current ◽  
Casting Method ◽  
Glass Forming ◽  
Minor Addition ◽  
Corrosion Behaviors ◽  
Thermal Stability Of

The (Cu50Zr45Al5)100-XYX(x=0, 1, 2, and 3) alloys samples were prepared by copper mold suction casting method. The effect of the addition of Y on the structure, glass-forming ability, thermal stability and corrosion behaviors of the base BMG (Cu50Zr45Al5) were investigated by means of XRD, DSC, DTA and electrochemical polarization. The results showed that Cu10Zr7and Zr2Cu phases are precipitated when Y addition exceeds 3at%, otherwise the alloys are fully amorphous state. Minor addition Y improved the thermal stability of the base alloy. The corrosion resistance of BMG alloy is deteriorated in 3.5% NaCl solution with addition of Y element as indicated by the corrosion potential and corrosion current density.

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 Glass-Forming Ability and Corrosion Resistance of Al88Y8−xFe4+x (x = 0, 1, 2 at.%) Alloys

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1581
Author(s):  
Rafał Babilas ◽  
Monika Spilka ◽  
Katarzyna Młynarek ◽  
Wojciech Łoński ◽  
Dariusz Łukowiec ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Analytical Techniques ◽  
Corrosion Current ◽  
Glass Forming Ability ◽  
Electrochemical Tests ◽  
Glass Forming ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Amorphous Structures ◽  
The Impact

The effect of iron and yttrium additions on glass forming ability and corrosion resistance of Al88Y8-xFe4+x (x = 0, 1, 2 at.%) alloys in the form of ingots and melt-spun ribbons was investigated. The crystalline multiphase structure of ingots and amorphous-crystalline structure of ribbons were examined by a number of analytical techniques including X-ray diffraction, Mössbauer spectroscopy, and transmission electron microscopy. It was confirmed that the higher Fe additions contributed to formation of amorphous structures. The impact of chemical composition and structure of alloys on their corrosion resistance was characterized by electrochemical tests in 3.5% NaCl solution at 25 °C. The identification of the mechanism of chemical reactions taking place during polarization test along with the morphology and internal structure of the surface oxide films generated was performed. It was revealed that the best corrosion resistance was achieved for the Al88Y7Fe5 alloy in the form of ribbon, which exhibited the lowest corrosion current density (jcorr = 0.09 μA/cm2) and the highest polarization resistance (Rp = 96.7 kΩ∙cm2).

scholarly journals Chemical Composition and Corrosion Behavior of a-C:H/DLC Film-Coated Titanium Substrate in Simulated PEMFC Environment

Coatings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 820
Author(s):  
Beibei Han ◽  
Mengyuan Yan ◽  
Dongying Ju ◽  
Maorong Chai ◽  
Susumu Sato
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Metal Ion ◽  
Ion Beam ◽  
Titanium Substrate ◽  
Corrosion Current ◽  
Ion Concentration ◽  
Bipolar Plates ◽  
High Adhesion ◽  
Corrosion Behaviors

The amorphous hydrogenated (a-C:H) film-coated titanium, using different CH4/H2 and deposition times, was prepared by the ion beam deposition (IBD) method, which has the advantage of high adhesion because of the graded interface mixes at the atomic level. The chemical characterizations and corrosion behaviors of a-C:H film were investigated and evaluated by SEM, AFM, Raman spectroscopy, EPMA, TEM and XPS. An a-C:H film-coated titanium was corroded at 0.8 V, 90 °C in a 0.5 mol/L H2SO4 solution for 168 h. The metal ion concentration in the H2SO4 corrosion solution and the potentiodynamic polarization behavior were evaluated. Results indicate that a higher CH4/H2 of 1:0 and a deposition time of 12 h can result in a minimum ID/IG ratio of 0.827, Ra of 5.76 nm, metal ion concentration of 0.34 ppm in the corrosion solution and a corrosion current of 0.23 µA/cm2. The current density in this work meets the DOE’s 2020 target of 1 µA/cm2. Electrical conductivity is inversely proportional to the corrosion resistance. The significant improvement in the corrosion resistance of the a-C:H film was mainly attributed to the increased sp3 element and nanocrystalline TiC phase in the penetration layer. As a result, the a-C:H film-coated titanium at CH4/H2 = 1:0 with improved anti-corrosion behavior creates a great potential for PEMFC bipolar plates.

Enhancement of glass-forming ability and corrosion resistance of Zr-based Zr-Ni-Al bulk metallic glasses with minor addition of Nb

2011 ◽  
Vol 110 (2) ◽  
pp. 023513 ◽  
Author(s):  
Yanhui Li ◽  
Wei Zhang ◽  
Chuang Dong ◽  
Chunling Qin ◽  
Jianbing Qiang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Minor Addition

Effects of Microcrystalline Cellulose on the Thermal Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

2011 ◽  
Vol 284-286 ◽  
pp. 1778-1781 ◽  
Author(s):  
Zhe Zhou ◽  
Hou Yong Yu ◽  
Mei Fang Zhu ◽  
Zong Yi Qin
Keyword(s):  
Thermal Stability ◽  
Thermal Properties ◽  
Microcrystalline Cellulose ◽  
Crystallization Temperature ◽  
Solvent Casting ◽  
Melt Crystallization ◽  
Casting Method ◽  
Nucleation Agent ◽  
Tga And Dsc ◽  
Thermal Stability Of

The composites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with different microcrystalline cellulose (MCC) contents were prepared by a solvent casting method. The effects of MCC on the thermal properties of PHBV were studied by TGA and DSC. The DSC results showed that the melt crystallization temperature of the PHBV/MCC increased from 41.9 °C for PHBV to 59.8 °C for the composites containing 20 wt. % MCC, which indicated that the crystallization of PHBV became easier with the addition of MCC. It also illustrated that the MCC could be used as an effective nucleation agent for the crystallization of PHBV. Moreover, it was found that the thermal stability of the PHBV/MCC composites increased compared with the neat PHBV.

Crystallization of Ni-Cr-Si-B and Ni-Cr-Fe-Si-B Amorphous Alloys

2014 ◽  
Vol 216 ◽  
pp. 35-38 ◽  
Author(s):  
Cosmin Codrean ◽  
Dragoş Buzdugan ◽  
Ramona Lǎzar ◽  
Viorel Aurel Şerban ◽  
Ion Mitelea
Keyword(s):  
Thermal Stability ◽  
Chemical Composition ◽  
Rapid Solidification ◽  
Amorphous Alloys ◽  
Structural Characteristics ◽  
Glass Forming Ability ◽  
Glass Forming ◽  
Melting Temperatures ◽  
Dta Analysis ◽  
Thermal Stability Of

Ni based amorphous alloys with Si and B, which can also, contains Fe and Cr, prepared by rapid solidification, have low melting temperatures. This fact increases their susceptibility to be joined by welding and brazing. The glass forming ability (GFA) is conditioned also by the crystallization delay, due to certain chemical composition of the alloys. The thermal stability of these alloys was revealed by DTA analysis and structural characteristics were investigated by XRD. Applying an annealing at temperatures between 420°C and 540°C, with 30 minutes maintaining time, allowed the investigation of phase occurred during the crystallization and the estimation of the crystalline grains dimensions.

Effect of Minor Addition Ta on the Thermal Stability and Corrosion Resistance of Ti-Zr-Cu-Pd Bulk Metallic Glasses

2013 ◽  
Vol 750 ◽  
pp. 23-26 ◽  
Author(s):  
Feng Xiang Qin ◽  
Guo Qiang Xie ◽  
Sheng Li Zhu ◽  
Zhen Hua Dan
Keyword(s):  
Thermal Stability ◽  
Plastic Deformation ◽  
Corrosion Resistance ◽  
Metallic Glasses ◽  
Anodic Polarization ◽  
Volume Fraction ◽  
Bulk Metallic Glasses ◽  
Large Plastic Deformation ◽  
Minor Addition ◽  
Proper Volume

In this research, the effect of Ta addition on the formation, thermal stability and corrosion behavior of Ti-Zr-Cu-Pd bulk metallic glasses were investigated. The results revealed with minor addition of Ta, higher corrosion resistance and compressive strength as well as large plastic deformation were achieved. Minor addition Ta is effective for the formation of more protectively passive film during the process of anodic polarization. In addition, proper volume fraction nanoparticle with small size is responsible for the large plastic deformation of the as-cast Ti-based bulk metallic glasses with 1% Ta addition.

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