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SUMMARY:Features and Usefulness of High-Order Multicomponent Glassy Alloys
  - Professor Akihisa Inoue
DTSTART:20180712T111500Z
DTEND:20180712T120000Z
UID:TALK108226@talks.cam.ac.uk
CONTACT:35808
DESCRIPTION:Akihisa Inoue 1-4\n\n1 International Institute of Green Materi
 als\, Josai International University\, Togane\, 283-8555\, Japan\n\n2 Scho
 ol of Materials Science and Engineering\, Tianjin University\, Tianjin\, 3
 00072\, China\n\n3 Department of Physics\, King Abdulaziz University\, Jed
 dah\, 22254\, Saudi Arabia\n\n4 MISiS\, National University of Science and
  Technology\, 119049\, Moscow\, Russia\n\nABSTRACT\n\nIt is known that Fe-
 based glassy alloys and Zr-Al-Ni-Cu base bulk metallic glasses (BMGs) have
  gained significant application fields as functional and structural materi
 al parts in personal computer and smartphone etc. and attracted further in
 creasing interest as novel engineering materials. By synthesizing a new ty
 pe of glass-based structure alloys and improving fundamental properties an
 d engineering characteristics of glassy alloys including BMGs\, their engi
 neering importance is expected to increase further in the near future. Mor
 e recently\, we have carried out the syntheses of high-order multicomponen
 t Fe-\, Zr- and Al-based glassy alloys with useful properties and reported
  the following results: In Fe-based alloys\, (1) the successes in forming 
 Fe-P-C-based BMGs with unprecedented plasticity as well as good soft magne
 tic and magnetocaloric properties\, (2) new Fe-based soft magnetic glassy 
 alloys with very high saturation magnetization above 1.9 T\, low coercivit
 y below 3 A/m\, high effective permeability above 2 × 104 at 1 kHz and hi
 gh Curie temperature\, (3) development of Fe-TM-P-B-Si (TM=transition meta
 l) base soft magnetic glassy alloys with magnetic characteristics exceedin
 g those for commercial magnetic glassy alloys “Liqualloy” and “SENNT
 IX”\, (4) pseudo-high entropy (PHE) Fe-based glassy alloys containing su
 b-nanoscale clusters with high strength and good ductility\, (5) finding o
 f ductilization phenomenon of nanostructure bcc-Fe + amorphous soft magnet
 ic alloy ribbons by micro crack-induced softening mechanism\, and (6) impr
 ovement effect of glass-forming ability of Fe-based BMGs in air and the ox
 ygen-containing atmosphere. In Zr-based alloys\, (1) synthesis of PHE clus
 tered BMGs caused by easy nucleation and sluggish growth rate and their hi
 gh thermal stability\, (2) synthesis of new PHE BMGs and the clarification
  of the role of PHE component in the glass-forming ability\, (3) formation
  of granular glassy structure due to immiscible element by casting process
  and its unique mechanical and crystallization behavior\, (4) reversible c
 hanges in glass transition behavior\, supercooled liquid region\, atomic c
 onfigurations and fundamental properties by controlling the ejection tempe
 rature of alloy liquid\, and (5) development of a new type of biomedical B
 MGs. In Al-based alloys\, (1) extension of Al + glassy phase field by choo
 sing suitable multicomponent alloy systems\, (2) novel reverse transformat
 ion phenomenon from metastable multicomponent compound to Al + amorphous p
 hase upon heating\, (3) proportional relation between the solute content i
 n amorphous phase and hardness in a wide hardness range and synthesis of A
 l + amorphous phase alloys with ultrahigh hardness. This presentation aims
  to introduce a part of our recent results on new glass-based structure al
 loys with novel phenomenon and useful properties for Fe-\, Zr- and Al-base
 d high-order multicomponent alloys prepared by melt spinning and copper mo
 ld casting processes.
LOCATION:Goldsmiths 1 lecture theatre (Department of Materials Science)
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