Developments and Applications of Bulk Glassy Alloys in Late Transition Metal Base System

Inoue, Akihisa; Shen, Baolong; Takeuchi, Akira

doi:10.2320/matertrans.47.1275

Cited by 118 publications

(60 citation statements)

References 38 publications

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“…But in the case of all BMG alloy gears, the wear life was 313 times higher than all-steel gears. 254 Encouraged by these results, Inoue et al 255 have fabricated the world's smallest size micro-geared motor (1?5 mm in diameter and 9?4 mm in length) using a highstrength Ni-based BMG alloy. The components of this geared motor cannot be made by any mechanical machining methods.…”

Section: Precision Gearsmentioning

confidence: 99%

Iron-based bulk metallic glasses

Suryanarayana

Inoue

2013

International Materials Reviews

528

161

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The current status of research and development in Fe-based bulk metallic glasses (BMGs) is reviewed. Bulk metallic glasses are relatively new materials possessing a glassy structure and large section thickness. These materials have an exciting combination of properties such as high mechanical strength, good thermal stability, large supercooled liquid region and potential for easy forming. Ever since the first synthesis of an Fe-based BMG in an Fe-Al-Ga-P-C-B system in 1995, there has been intense activity on the synthesis and characterisation of Fe-based BMGs. These BMGs exhibit some unique characteristics which have not been obtained in conventional Fe-based crystalline alloys. This uniqueness has led to practical uses of these bulk glassy alloys as soft magnetic and structural materials. This review presents the recent results on the glassforming ability, structure, thermal stability, mechanical properties, corrosion behaviour, soft magnetic properties and applications of Fe-based bulk glassy alloys developed during the last 15 years. This review also highlights the advanced analysis of their properties which has contributed significantly to the progress in understanding and developing of the Fe-based BMGs. The future prospects of Fe-based BMGs have also been presented.

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Section: Precision Gearsmentioning

confidence: 99%

Iron-based bulk metallic glasses

Suryanarayana

Inoue

2013

International Materials Reviews

528

161

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“…[1][2][3][4][5] These unique properties are applicable to industrial materials. 6,7) The mechanical behavior of BGAs at room temperature is quite different from that of crystalline alloys.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

et al. 2009

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No data are available about mechanical behavior of bulk glassy alloys (BGAs) in tension at cryogenic temperatures. In this study, we investigated the effect of temperature on the mechanical behavior of ternary eutectic and hypoeutectic Zr-Cu-Al BGAs fabricated by an arc tilt casting method. Tensile tests were performed for the BGA plates with gauge dimensions of 5 mm in length, 1.2 mm in width and 0.5 mm in thickness at temperatures of 295, 223, 173 and 77 K, at an initial strain rate of 5 Â 10 À4 s À1 . Measurements of elastic parameters were also made at temperatures from 97 to 342 K by an ultrasonic pulse method. It is found that the tensile strength and elongation for both BGAs increase with decreasing testing temperature, which is reported for the first time under a tensile condition. At cryogenic temperatures, the tensile elongation of the hypoeutectic Zr 59 Cu 31 Al 10 BGA tends to be higher than that of the eutectic Zr 50 Cu 40 Al 10 BGA, although the difference is small. Multiple shear bands are observed on the side surface deformed at lower temperatures. The Young's and shear moduli, and Debye temperature monotonically increase with decreasing temperature. This indicates that the BGA becomes rigid and the effective atomic distance decreases at cryogenic temperatures, leading to the increase of the tensile strength at cryogenic temperatures.

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“…5,6) The yield strain of the present alloy is about 4:6 Â 10 À3 , which is also lower than those ($2 Â 10 À2 ) reported for the casted metallic glasses. 12) The fracture surface of the test sample is shown in Fig. 11.…”

Section: Methodsmentioning

confidence: 99%

Consolidation of [(Fe0.5Co0.5)0.75Si0.05B0.2]96Nb4 Metallic Glassy Powder by SPS Method

et al. 2009

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Metallic glasses have been reported to exhibit excellent properties, such as high strength, high corrosion resistance, high wear resistance, which result from their amorphous structure. Because of a drastic reduction in their viscosities in supercooled liquid region, metallic glasses have an excellent workability through viscous deformation for the production of various industrial parts.Recently, much attention has been paid to Fe-based metallic glasses because of their rich resources in addition to their excellent mechanical and magnetic properties. However, due to their poor glass-forming ability, the size of the Fe-based bulk metallic glass by conventional casting techniques is limited. In the present investigation, nearly fully densified disk-shaped compacts of [(Fe 0:5 Co 0:5 ) 0:75 Si 0:05 B 0:2 ] 96 Nb 4 metallic glass were produced from a gas-atomized amorphous powder by spark plasma sintering (SPS). The processing temperature and the time that assure the supercooled liquid state of the compacts were determined from the Time-Temperature-Transformation (TTT) diagram that was constructed by isothermal differential scanning calorimetry. The mechanical properties of the consolidated samples were evaluated by compression test. Comparatively low values of the fracture stress, Young's modulus and yielding stress of SPSed sample compared to the casted samples were observed, which is discussed on the basis of the integrity of the interparticle bonding.

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Developments and Applications of Bulk Glassy Alloys in Late Transition Metal Base System

Cited by 118 publications

References 38 publications

Iron-based bulk metallic glasses

Iron-based bulk metallic glasses

Enhanced Tensile Strength and Plasticity of Zr-Cu-Al Bulk Glassy Alloys at Cryogenic Temperatures

Consolidation of [(Fe<SUB>0.5</SUB>Co<SUB>0.5</SUB>)<SUB>0.75</SUB>Si<SUB>0.05</SUB>B<SUB>0.2</SUB>]<SUB>96</SUB>Nb<SUB>4</SUB> Metallic Glassy Powder by SPS Method

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