Tsuyoshi Masumoto’s research while affiliated with Tohoku University and other places

... As demonstrated by metallurgical data, the solubility of N in liquid Fe at 1 atm is as low as~0.045 wt% and sharply decreases with increased temperatures and concentrations of solute Ni [46,47]. Early estimates of the chemical composition of bulk silicate Earth largely presumed that N was only abundant on the surface but depleted in the deep interior [48,49]. ...

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Electrical Resistivity and Phase Evolution of Fe–N Binary System at High Pressure and High Temperature

... These studies mainly focus on the microstructural evolution and magnetic properties of as-atomized powders. Further studies exclusively report on powder consolidation such as Layer Additive Manufacturing [181], Warm Hydrostatic Extrusion [182], Warm Rolling [183], Spark Plasma Sintering [184], Severe Plastic Deformation [185], Cold Spraying [186], and Thermoplastic Forming [187,188]. The study by Zheng et al. is an exception [26,31], as the authors reported the gas atomization of amorphous aluminum powders in detail. ...

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PhD thesis: Cooling strategies for the atomization of glass-forming alloys

... Based on the main component elements, the Tibased MGs ever-developed could be classified into 4 categories, i.e., TiZrBe-based MGs [6][7][8][9], TiCuNibased MGs [10][11][12][13], TiZrCu-based MGs [14][15][16][17][18], and TiZrSi-based MGs [19][20][21][22], which show distinct glass forming abilities (GFAs). The GFA of MGs is usually indicated with the critical diameter of the maximum MG rod that could be fabricated by casting. ...

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Effects of microalloying on the isothermal and non-isothermal crystallization behaviors of TiZrSi-based metallic glasses

... The noncrystalline structure also improves wear and corrosion resistance and lowers friction in BMGs [26][27][28][29][30][31]. Several BMGs are tailored for specific functional properties such as biocompatibility [32][33][34][35][36], biodegradability [37][38][39], catalytic activity [40][41][42][43][44][45], and ferromagnetism [46][47][48][49]. ...

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Review of Thermoplastic Drawing with Bulk Metallic Glasses

... 10,11 In the (Fe-Co)-(Mg-F) system, the high temperature environment makes the granules larger, and hence the electrical resistivity becomes larger and the MR ratio becomes smaller. 12,13 It is thought that the increasing the size of the Fe-Co granules changes the magnetic state and the structure of magnetic tunnel junctions, and thereby the electric properties of the film. For practical use for the magnetic sensors, it is important to improve the film's thermal stability. ...

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Improvement of thermal stability of nano-granular TMR films by using a Mg-Al-O insulator matrix

... While these approaches can effectively describe specific viscoelastic responses, they often involve many fitting parameters, increasing the risk of overfitting and reducing the reliability of the predictive power of theoretical models. Newtonian flow is typically observed at low strain rate or elevated temperature, while plastic deformation transforms to non-Newtonian behavior at high rate or lower temperature, particularly below the glass transition temperature [8,9]. Non-Newtonian behavior has been attributed to stress overshoot, which induces structural disordering through the rapid increase of stress-induced free volume [10,11]. ...

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Non-Newtonian Rheology in Stress Relaxation of Metallic Glasses

... It should be noted that the nanogranular film, which has a small amount of magnetic metal, becomes a transparent magnetic material with a large Faraday effect [12][13][14]. Furthermore, nanogranular films have practical advantages such as ease of production, good reproducibility, and good heat resistance [15,16]. On the other hand, existing magneto-optical materials (thin films with high figure of merit [17]) do not have a large coercive force and require an external magnetic field to stabilize their magnetization state. ...

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Faraday effect in CoPt-CaF2 nanogranular films with hard magnetic property for magnetic-field-free faraday devices

... 2) The application of this type of alloy to precision mechanical equipment is progressing, and the importance of strength and other mechanical characteristics is also increasing. 3) As "additional processing," additive manufacturing technology of alloy materials has been called the third pro-cessing method after "cutting technology" by machining and related techniques and "forming technology," such as casting, forging, and press forming. Additive manufacturing is now applied in an increasing number of cases, firstly because it is possible to produce parts with shapes that cannot be obtained by conventional processes, and also because shortening of the delivery times when manufacturing products with complex shapes are also expected accompanying progress in process digitalization. ...

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Comparison of Fatigue Crack Propagation Behavior of Additive-Manufactured Zero Thermal Expansion Alloy with Forged and Casted Materials

... One of the most characteristic properties of the prepercolated ferromagnetic metal -insulator composites is a tunnel magnetoresistance (TMR). The relatively high values of TMR are usually observed in the cobalt-based composites [1][2][3][4][5][6][7][8]. For example, the TMR value is 7 -8 % in composites with mono-element ferromagnetic phase (Co-Al-O [2,7]). ...

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The effect of oxygen-free MgF2 matrix on the physical properties of (CoFeZr)х(MgF2)100−х nanocomposites

... Therefore, amorphous/nanocrystalline Fe-based alloys are considered in various applications such as magnetic cores and magnetic screens. [64][65][66] The aim of this paper was to manufacture novel, low-cost [9,67] nanocrystalline Fe 79 B 20Àx M x Cu 1 (where x = 0 or 4; M = Ti, Mo, Mn) bulk alloys directly in the casting process without performing additional heat treatment. Comprehensive studies of the relationship of microstructure to mechanical and magnetic properties were performed in a wide range of mechanical loads, temperature, and magnetic fields. ...

Reference:

Effect of Alloying Additions on Microstructure, Mechanical and Magnetic Properties of Rapidly Cooled Bulk Fe-B-M-Cu (M = Ti, Mo and Mn) Alloys