https://www.tcd.ie/Physics/people/Graham.Cross/SF%20Poster%202011/Inoue-ActaMater00-Stabilization%20of%20metallic%20supercooled%20liquid%20and%20bulk%20amorphous%20alloys.pdf

Stabilization of metallic supercooled liquid and bulk amorphous alloys

Microstructures and properties of high-entropy alloys

Amorphous alloys were first developed over 40 years ago and found applications as magnetic core or reinforcement added to other materials. The scope of applications is limited due to the small thickness in the region of only tens of microns. The research effort in the past two decades, mainly pioneered by a Japanese- and a US-group of scientists, has substantially relaxed this size constrain. Some bulk metallic glasses can have tensile strength up to 3000 MPa with good corrosion resistance, reasonable toughness, low internal friction and good processability. Bulk metallic glasses are now being used in consumer electronic industries, sporting goods industries, etc. In this paper, the authors reviewed the recent development of new alloy systems of bulk metallic glasses. The properties and processing technologies relevant to the industrial applications of these alloys are also discussed here. The behaviors of bulk metallic glasses under extreme conditions such as high pressure and low temperature are especially addressed in this review. In order that the scope of applications can be broadened, the understanding of the glass-forming criteria is important for the design of new alloy systems and also the processing techniques.

https://www.tcd.ie/Physics/people/Graham.Cross/SF%20Poster%202011/Shek-MaterSciEng04-Bulk%20Metallic%20Glasses.pdf

Bulk metallic glasses

Bulk metallic glasses (BMGs) have been classified according to the atomic size difference, heat of mixing (� H mix ) and period of the constituent elements in the periodic table. The BMGs discovered to date are classified into seven groups on the basis of a previous result by Inoue. The seven groups are as follows: (G-I) ETM/Ln-LTM/BM-Al/Ga, (G-II) ETM/Ln-LTM/BM-Metalloid, (G-III) Al/Ga-LTM/BMMetalloid, (G-IV) IIA-ETM/Ln-LTM/BM, (G-V) LTM/BM-Metalloid, (G-VI) ETM/Ln-LTM/BM and (G-VII) IIA-LTM/BM, where ETM, Ln, LTM, BM and IIA refer to early transition, lanthanide, late transition, group IIIB–IVB and group IIA-group metals, respectively. The main alloying element of ternary G-I, G-V and G-VII, ternary G-II and G-IV, and ternary G-VI BMGs is the largest, intermediate and smallest atomic radius compared to the other alloying elements, respectively. The main alloying element of ternary BMGs belonging to G-I, G-V, G-VI and G

Classification of Bulk Metallic Glasses by Atomic Size Difference, Heat of Mixing and Period of Constituent Elements and Its Application to Characterization of the Main Alloying Element

https://www.andrew.cmu.edu/user/dl0p/laughlin/pdf/PMS.pdf

Amorphous and nanocrystalline materials for applications as soft magnets

PROBLEM TO BE SOLVED: To provide a metallic material providing a magnetic metal powder capable of facilitating enhancing insulation property of a surface of a magnetic member while inhibiting effects to provide magnetic property.SOLUTION: There is provided an Fe-based amorphous alloy having a composition formula represented by FeNiCrPCBSiwith 0 at%≤a≤10 at%, 0 at%≤b≤6 at%, 6.8 at%≤x≤13.0 at%, 2.2 at%≤y≤13.0 at%, 0 at%≤z≤9.0 at%, 0.26 at%<t≤2.0 at%.SELECTED DRAWING: Figure 2

Fe-BASED AMORPHOUS ALLOY, MAGNETIC METAL POWDER, MAGNETIC MEMBER, MAGNETIC COMPONENT AND ELECTRICAL AND ELECTRONIC EQUIPMENT

結晶質磁性材料の粉末および非晶質磁性材料の粉末を含有する圧粉コアであって、かかる圧粉コアを備えるインダクタについて、直流重畳特性を向上させることおよび鉄損を低減させることが可能な圧粉コアとして、結晶質磁性材料の粉末および非晶質磁性材料の粉末を含有する圧粉コアであって、結晶質磁性材料の粉末の含有量と非晶質磁性材料の粉末の含有量との総和は、８３質量％以上であり、上記の総和に対する結晶質磁性材料の粉末の含有量の質量比率は、２０質量％以下であり、非晶質磁性材料の粉末のメジアン径Ｄ５０は結晶質磁性材料の粉末のメジアン径Ｄ５０以上であり、非晶質磁性材料の粉末の体積基準の累積粒度分布における１０％累積径Ｄ１０ ａ の、結晶質磁性材料の粉末の体積基準の累積粒度分布における９０％累積径Ｄ９０ ｂ に対する比は、０．３以上２．６以下である圧粉コアが提供される。

圧粉コア、当該圧粉コアの製造方法、該圧粉コアを備えるインダクタ、および該インダクタが実装された電子・電気機器

This hybrid core 10 is provided with: a central leg portion 11; side leg portions 12, 12 disposed on both sides of the central leg portion 11; and a core body portion including connecting portions 13, 13 connecting the central leg portion 11 and the side leg portions 12, 12. The hybrid core 10 is characterized in that the core body portion is configured from an oxide magnetic material, and the central leg portion 11 includes a permeability adjustment portion 111, wherein the permeability adjustment portion 111 includes a portion comprising a compacted powder molding of a mixture powder including an Fe-group amorphous magnetic alloy powder and a binder component. With the hybrid core 10, it is possible to reduce reactor loss.

Hybrid core, reactor, and electric/electronic apparatus

PROBLEM TO BE SOLVED: To provide a method for manufacturing a magnetic element in which a plurality of magnetic elements having excellent inductance and Q value can be formed at a time especially by a simple manufacturing method, and also to provide the magnetic element formed using a manufacturing method thereof.SOLUTION: The longitudinal direction of a first magnetic sheet 17 made of a long magnetic member is oriented to the Y1-Y2 direction, and the first magnetic sheet 17 is put in a state separated from at least one of a first extraction electrode layer 15 and a second extraction electrode layer 16 positioned on both sides in the X1-X2 direction, and adhered to a first coil 12 side. Moreover, there is a second coil on the rear surface too, and a second magnetic sheet 30 made of the long magnetic member covering the second coil is adhered thereto in the same way as the first magnetic sheet. Thereafter, an insulation substrate is singulated for each thin inductor 10.

Method for manufacturing magnetic element and magnetic element

As a powder magnetic core having little loss and high initial magnetic permeability, provided is a powder magnetic core that contains: a magnetic powder of an Fe-based Cr-containing amorphous alloy and an organic binding substance. The composition depth profile from the surface side of the magnetic powder in the powder magnetic core has the following characteristics: (1) An oxygen-containing region having an O/Fe ratio of at least 0.1 can be defined from the surface of the magnetic powder and the depth of oxygen-containing region the surface of the magnetic powder is at least 35 nm. (2) A carbon-containing region having a C/O ratio of at least 1 can be defined from the surface of the magnetic powder and the depth of the carbon-containing region from the surface of the magnetic powder is no more than 5 nm. (3) The oxygen-containing region has a Cr enriched section wherein the bulk Cr ratio exceeds 1.

Hisato Koshiba

Papers

Fe-BASED AMORPHOUS ALLOY, MAGNETIC METAL POWDER, MAGNETIC MEMBER, MAGNETIC COMPONENT AND ELECTRICAL AND ELECTRONIC EQUIPMENT

圧粉コア、当該圧粉コアの製造方法、該圧粉コアを備えるインダクタ、および該インダクタが実装された電子・電気機器

Hybrid core, reactor, and electric/electronic apparatus

Method for manufacturing magnetic element and magnetic element

Powder magnetic core and method for producing same