Structure and Corrosion Behavior of Mg-Cu-Y-(Zn,Ni) Bulk Metallic Glasses

2015 ◽  
Vol 227 ◽  
pp. 23-26
Author(s):  
Rafał Babilas ◽  
Katarzyna Cesarz-Andraczke ◽  
Dorota Babilas ◽  
Wojciech Simka
Keyword(s):  
Corrosion Behavior ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Bulk Metallic Glasses ◽  
Pure Magnesium ◽  
Cast State ◽  
Surface Layers ◽  
Glassy Alloys ◽  
Ni Addition ◽  
Better Than

The work presents a structural and corrosion resistance analysis of Mg-based bulk metallic glasses in “as-cast” state. The studies were performed on bulk glassy samples in the form of plates. The structure analysis of the samples in “as-cast” state was carried out by the XRD and DSC methods. The corrosion behavior of the bulk glassy alloys and pure magnesium samples was studied by electrochemical measurements and immersion tests in 5% NaCl solution at room temperature. For the amorphous alloys the highest corrosion potential was achieved, indicating the formation of protective surface layers with Mg and Cu oxides. The corrosion behavior of the alloys with Zn and Ni addition was found to be better than pure magnesium.

scholarly journals A Conflict of Fineness and Stability: Platinum- and Palladium-Based Bulk Metallic Glasses for Jewellery

2020 ◽  
Author(s):  
O. S. Houghton ◽  
A. L. Greer
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Precious Metals ◽  
High Hardness ◽  
Scratch Resistance ◽  
Cast State ◽  
High Definition ◽  
Glass Forming ◽  
Thermoplastic Forming ◽  
Near Net Shape

For the metals used in jewellery, high hardness and the associated scratch resistance are much sought after. Conventional crystalline alloys for jewellery are alloyed and extensively processed (thermally and mechanically) to improve hardness, but it is difficult to reach values beyond 300 HV. The advent of bulk metallic glasses, based on precious metals and with hardness exceeding 300 HV in the as-cast state, is therefore of great interest for both jewellery and watchmaking. The non-crystalline structure of these materials not only gives high hardness, but also the opportunity to shape metals like plastics, via thermoplastic forming. For more traditional jewellery manufacture, bulk metallic glasses also exhibit high-definition and near-net-shape casting. Gold-based alloys have long dominated the consideration of bulk metallic glasses for jewellery as they can comply with 18K hallmarks. Although bulk metallic glasses based on platinum or palladium possess excellent thermoplastic formability, and are without known tarnishing problems, achieving useful glass-forming ability within the more restrictive hallmarking standards typically used for jewellery (≥95 wt.% Pt or Pd) is, at best, challenging. In this review, platinum- and palladium-based bulk metallic glasses are discussed, focusing on their potential application in jewellery and on the further research that is necessary.

Corrosion behavior of bulk metallic glasses in different aqueous solutions

2010 ◽  
Vol 53 (3) ◽  
pp. 435-439 ◽  
Author(s):  
Gong Li ◽  
Lei Huang ◽  
YanGuo Dong ◽  
GuoWei He ◽  
Li Qi ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Corrosion Behavior ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses

scholarly journals Effect of alloying elements on the microstructure and corrosion behavior of TiZr-based bulk metallic glasses

2020 ◽  
Vol 177 ◽  
pp. 108854
Author(s):  
Aléthéa Liens ◽  
Benoît Ter-Ovanessian ◽  
Nicolas Courtois ◽  
Damien Fabregue ◽  
Takeshi Wada ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Alloying Elements ◽  
Effect Of Alloying

Bulk Metallic Glasses

2008 ◽  
Vol 604-605 ◽  
pp. 229-238
Author(s):  
Marcello Baricco ◽  
Tanya A. Başer ◽  
Gianluca Fiore ◽  
Rafael Piccin ◽  
Marta Satta ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Rapid Quenching ◽  
Second Phase ◽  
Research Activity ◽  
Long Time ◽  
Geometrical Constraints

Rapid quenching techniques have been successfully applied since long time for the preparation of metallic glasses in ribbon form. Only in the recent years, the research activity addressed towards the synthesis of bulk metallic glasses (BMG), in form of ingots with a few millimetres in thickness. These materials can be obtained by casting techniques only for selected alloy compositions, characterised by a particularly high glass-forming tendency. Bulk amorphous alloys are characterised by a low modulus of elasticity and high yielding stress. The usual idea is that amorphous alloys undergo work softening and that deformation is concentrated in shear bands, which might be subjected to geometrical constraints, resulting in a substantial increase in hardness and wear resistance. The mechanical properties can be further improved by crystallisation. In fact, shear bands movement can be contrasted by incorporating a second phase in the material, which may be produced directly by controlled crystallisation. Soft magnetic properties have been obtained in Fe-based systems and they are strongly related to small variations in the microstructure, ranging from a fully amorphous phase to nanocrystalline phases with different crystal size. The high thermal stability of bulk metallic glasses makes possible the compression and shaping processes in the temperature range between glass transition and crystallisation. Aim of this paper is to present recent results on glass formation and properties of bulk metallic glasses with various compositions. Examples will be reported on Zr, Fe, Mg and Pd-based materials, focussing on mechanical and magnetic properties.

Corrosion Behavior of Sm-Based Bulk Metallic Glasses in Salt Solution

2012 ◽  
Vol 229-231 ◽  
pp. 26-30
Author(s):  
Lin Bo Li ◽  
Jing Guo ◽  
Fei Peng Lou
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Salt Solution ◽  
Metallic Glasses ◽  
Glassy State ◽  
Bulk Metallic Glasses ◽  
Immersion Test ◽  
Comparison Study ◽  
Corrosion Behaviors

In this paper, the corrosion behaviors of Sm-based bulk metallic glasses (BMGs) were investigated by immersion test. It was found that with Co content increasing the ability of corrosion resistance of the alloy increases for Sm-based bulk metallic glasses. A comparison study was made on the corrosion behaviors between the glassy state alloys and crystalline alloys with the same ingredients. The results show that the glassy state alloy has the better corrosion resistance.

scholarly journals The precipitation of nanocrystalline structure in the joule heated Fe72Al5Ga2P11C6B4 metallic glasses

2012 ◽  
Vol 48 (2) ◽  
pp. 319-324 ◽  
Author(s):  
N. Mitrovic ◽  
S. Kane ◽  
S. Roth ◽  
A. Kalezic-Glisovic ◽  
C. Mickel ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Amorphous Matrix ◽  
Annealing Treatment ◽  
Nanocrystalline Structure ◽  
Heating Power ◽  
Cast State ◽  
Current Annealing ◽  
Residual Amorphous Matrix ◽  
Crystalline Component

In this study, the evolution of the nanostructure on dc Joule heated Fe72Al5Ga2P11C6B4 metallic glass ribbons have been investigated. Heating power per square area (PS) was ranging between 0.8 to 7.1 W/cm2 in order to get various stages of relaxation or nanocrystallization. The crystallization starts after applying PS ? 4.35 W/cm2 and the sample consist of residual amorphous matrix, a magnetic crystalline component and also a non-magnetic crystalline component (relative abundance of Fe in the crystalline phase is about 35 %). XRD measurements show that crystalline samples after current annealing consist of Fe3B, FeC, FeP and Fe3P compounds. On TEM micrograph a broad distribution of shapes and sizes is noticed, the latter range from about 60 to 350 nm, increasing by applied heating power. The decrease of the electrical resistivity after each current annealing treatment is rather small in comparison with other Fe-based amorphous alloys (only about 1.5 % for the highest PS). Partial nanocrystallization leads to increase of coercive field (from HC ? 7 A/m in the amorphous as-cast state up to 45 A/m) attributed to precipitation of magnetically harder compounds (Fe3B and FeC).

Study on corrosion behavior of Mg-based bulk metallic glasses in NaCl solution

2016 ◽  
Vol 209 ◽  
pp. 632-642 ◽  
Author(s):  
Rafał Babilas ◽  
Anna Bajorek ◽  
Wojciech Simka ◽  
Dorota Babilas
Keyword(s):  
Corrosion Behavior ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Nacl Solution
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