scholarly journals Microstructure and Magnetic Properties of Selected Laser Melted Ni-Mn-Ga and Ni-Mn-Ga-Fe Powders Derived from as Melt-Spun Ribbons Precursors

Metals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 903
Author(s):  
Wojciech Maziarz ◽  
Paweł Czaja ◽  
Robert Chulist ◽  
Anna Wójcik ◽  
Łukasz Żrodowski ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Selective Laser Melting ◽  
Average Particle Size ◽  
Milled Powder ◽  
High Energy ◽  
Average Particle ◽  
Laser Melting ◽  
Melt Spun ◽  
Melt Spun Ribbons

Selective Laser Melting was successfully used as a fabrication method to produce Ni-Mn-Ga and Ni-Mn-Ga-Fe ferromagnetic shape memory alloys. The starting material in a powder form with an average particle size of about 17.6 µm was produced by milling of as melt-spun ribbons. The microstructure, phase composition, and martensitic transformation behavior of both powder precursors and laser melted alloys were investigated by several methods, including high energy X-ray diffraction, electron microscopy, and vibrating sample magnetometry. The as laser melted materials are chemically homogenous and show a typical layered microstructure. Both alloy compositions have a duplex structure consisting either of austenite and 10M martensite (Ni-Mn-Ga) or a mixture of 14M and NM martensitic phases (Ni-Mn-Ga-Fe), contrary to the as milled powder precursors showing fcc structure in both cases. The forward martensitic transformation takes place at 336 and 325 K for Ni-Mn-Ga and Ni-Mn-Ga-Fe, respectively, while the magnetic response is much stronger for Ni-Mn-Ga than for the quaternary alloy. The results show that Selective Laser Melting allows for producing of good quality, homogenous materials. However, their microstructural features and consequently shape memory behavior should be tailored by additional heat treatment.

Effect of high-rate annealing on microstructure, martensitic transformation and shape memory behavior of TiNiCu melt-spun ribbons

2019 ◽  
Vol 248 ◽  
pp. 48-51 ◽  
Author(s):  
Alexander Shelyakov ◽  
Nikolay Sitnikov ◽  
Irina Khabibullina ◽  
Natalia Tabachkova ◽  
Vyacheslav Fominski ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
High Rate ◽  
Shape Memory Behavior ◽  
Melt Spun ◽  
Melt Spun Ribbons

Processing of Alumina Reinforced Copper Metal Matrix Composite by Selective Laser Melting Technology

2021 ◽  
Vol 316 ◽  
pp. 175-180
Author(s):  
R.M. Baitimerov ◽  
V.A. Bykov
Keyword(s):  
Composite Material ◽  
Selective Laser Melting ◽  
Average Particle Size ◽  
Particle Diameter ◽  
Weight Ratio ◽  
Alumina Powder ◽  
Powder Materials ◽  
Average Particle ◽  
Laser Melting ◽  
Alumina Composite

For the development of the additive technologies it is necessary to expand the range of the used materials. One of the most promising directions is the creation of products from composite materials. In this work copper-alumina composite powder was prepared by ball milling, and used in selective laser melting, to produce a composite material. The raw powder materials consisted of the gas atomized Cu powder (with the regular spherical shape and mean particle diameter of 32 μm) and alumina powder, produced by condensation of vapor on electrostatic filter (average particle size is about 220 nm). The alumina weight ratio was 5%. Four 30x10x6 mm copper-alumina specimens were manufactured. The scanning electron microscopy was used for the analysis of composite microstructure. Obtained copper-alumina composite material has higher hardness, in comparison with cast copper (HRB is 60 and 45, respectively).

scholarly journals Martensitic Transformation Behavior and Shape Memory Properties of Ti–Ni–Pt Melt-Spun Ribbons

2006 ◽  
Vol 47 (3) ◽  
pp. 540-545 ◽  
Author(s):  
Tomonari Inamura ◽  
Yohei Takahashi ◽  
Hideki Hosoda ◽  
Kenji Wakashima ◽  
Takeshi Nagase ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shape Memory ◽  
Transformation Behavior ◽  
Melt Spun ◽  
Shape Memory Properties ◽  
Melt Spun Ribbons

scholarly journals Green synthesis: Proposed mechanism and factors influencing the synthesis of platinum nanoparticles

2020 ◽  
Vol 9 (1) ◽  
pp. 386-398 ◽  
Author(s):  
Mahmood S. Jameel ◽  
Azlan Abdul Aziz ◽  
Mohammed Ali Dheyab
Keyword(s):  
Green Synthesis ◽  
Reaction Temperature ◽  
Platinum Nanoparticles ◽  
Energy Requirement ◽  
Average Particle Size ◽  
High Energy ◽  
Energy Utilization ◽  
Critical Parameters ◽  
Synthesis Process ◽  
Average Particle

AbstractPlatinum nanoparticles (Pt NPs) have attracted interest in catalysis and biomedical applications due to their unique structural, optical, and catalytic properties. However, the conventional synthesis of Pt NPs using the chemical and physical methods is constrained by the use of harmful and costly chemicals, intricate preparation requirement, and high energy utilization. Hence, this review emphasizes on the green synthesis of Pt NPs using plant extracts as an alternative approach due to its simplicity, convenience, inexpensiveness, easy scalability, low energy requirement, environmental friendliness, and minimum usage of hazardous materials and maximized efficiency of the synthesis process. The underlying complex processes that cover the green synthesis (biosynthesis) of Pt NPs were reviewed. This review affirms the effects of different critical parameters (pH, reaction temperature, reaction time, and biomass dosage) on the size and shape of the synthesized Pt NPs. For instance, the average particle size of Pt NPs was reported to decrease with increasing pH, reaction temperature, and concentration of plant extract.

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