Viscous Flow Forming of Zr-Based Bulk Metallic Glasses for Industrial Products

Soejima, Hideki; Nishiyama, Nobuyuki; Takehisa, Hiroyuki; Shimanuki, Masakazu; Inoue, Akihisa

doi:10.4028/www.scientific.net/jmnm.24-25.531

Cited by 10 publications

(8 citation statements)

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“…5). The process is also known as hot forming,238 hot pressing,239 super plastic forming,81 viscous flow working,117 and viscous flow forming 240. TPF takes advantage of the drastic softening of the BMG former upon heating above T g and its thermal stability.…”

Section: Processingmentioning

confidence: 99%

Processing of Bulk Metallic Glass

2010

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Bulk metallic glass (BMG) formers are multicomponent alloys that vitrify with remarkable ease during solidification. Technological interest in these materials has been generated by their unique properties, which often surpass those of conventional structural materials. The metastable nature of BMGs, however, has imposed a barrier to broad commercial adoption, particularly where the processing requirements of these alloys conflict with conventional metal processing methods. Research on the crystallization of BMG formers has uncovered novel thermoplastic forming (TPF)-based processing opportunities. Unique among metal processing methods, TPF utilizes the dramatic softening exhibited by a BMG as it approaches its glass-transition temperature and decouples the rapid cooling required to form a glass from the forming step. This article reviews crystallization processes in BMG former and summarizes and compares TPF-based processing methods. Finally, an assessment of scientific and technological advancements required for broader commercial utilization of BMGs will be made.

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Section: Processingmentioning

confidence: 99%

Processing of Bulk Metallic Glass

2010

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“…260 Reasons for the choice of these materials and the details of applications may be found in Ref. 7.…”

Section: Shot Peening Ballsmentioning

confidence: 99%

Iron-based bulk metallic glasses

Suryanarayana

Inoue

2013

International Materials Reviews

543

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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“…Therefore, these alloys have already found some important applications in the industry [4][5][6][7][8][9][10]. Its products involve the golf clubs [11], optical components [12,13], pressure sensor [14], mechanical spring [15], and of aircraft structure parts [16]. In addition to their interesting applications, Zr 55 Cu 30 Al 10 Ni 5 with an excellent stability over a large supercooled liquid region, provide a large experimental time scale to study the glass transition and crystallization behaviors [17].…”

Section: Introductionmentioning

confidence: 99%

“…2. From the slope of the straight line which is multiplied by ideal gas constant R, we derived the value of the activation energy for crystallization E c = 325 ± 7 kJ/mol, what is higher than 212 kJ/mol from 743 K to 753 K and 314 kJ/mol from 723 K to 739 K [6,16]. Meanwhile that herald Fig.…”

Section: Introductionmentioning

confidence: 99%