Characteristic behavior of Pt-based metallic glass under rapid heating and its application to microforming

The formability of a Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass has been investigated in the present study in relation to the heating rate. A series of extrusion tests after rapid heating has been performed in a laboratory scale together with sheet forming tests after slow heating for comparison purpose. The basic processing map based on dynamic materials model (DMM) and compression test data has been utilized to evaluate feasible forming conditions. The macroscopic formability, classified by fully formed, partially formed or a catastrophic fracture, is found to have a good correspondence with the iso-efficiency contour in the processing map. The region of high power dissipation efficiencies with η>0.8 is found to be broaden by avoiding crystallization events due to reduced exposure time in extrusion process with a faster heating rate.

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Characteristic behavior of La55Al25Ni20 amorphous alloy under rapid heating

Materials Science and Engineering A ◽

10.1016/s0921-5093(00)01604-x ◽

2001 ◽

Vol 304-306 ◽

pp. 743-746 ◽

Cited By ~ 18

Author(s):

Yasunori Saotome ◽

Keiichi Roppongi ◽

Tao Zhang ◽

Akihisa Inoue

Keyword(s):

Amorphous Alloy ◽

Rapid Heating ◽

Characteristic Behavior

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Extrusion formability and deformation behavior of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass in an undercooled liquid state after rapid heating

Materials Science and Engineering A ◽

10.1016/j.msea.2005.03.103 ◽

2005 ◽

Vol 399 (1-2) ◽

pp. 238-243 ◽

Cited By ~ 33

Author(s):

Kwang Seok Lee ◽

Young Won Chang

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Liquid State ◽

Deformation Behavior ◽

Rapid Heating ◽

Undercooled Liquid

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UHV-TEM studies of laser-induced damage

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100087471 ◽

1991 ◽

Vol 49 ◽

pp. 632-633

Author(s):

T.S. Savage ◽

R. Ai ◽

D. Dunn ◽

L.D. Marks

Keyword(s):

Surface Science ◽

Rapid Heating ◽

Local Heating ◽

Routine Practice ◽

Transmission Electron ◽

Northwestern University ◽

Laser Induced Damage ◽

Set Up ◽

Focusing Lens ◽

Diffusion Of Impurities

The use of lasers for surface annealing, heating and/or damage has become a routine practice in the study of materials. Lasers have been closely looked at as an annealing technique for silicon and other semiconductors. They allow for local heating from a beam which can be focused and tuned to different wavelengths for specific tasks. Pulsed dye lasers allow for short, quick bursts which can allow the sample to be rapidly heated and quenched. This short, rapid heating period may be important for cases where diffusion of impurities or dopants may not be desirable.At Northwestern University, a Candela SLL - 250 pulsed dye laser, with a maximum power of 1 Joule/pulse over 350 - 400 nanoseconds, has been set up in conjunction with a Hitachi UHV-H9000 transmission electron microscope. The laser beam is introduced into the surface science chamber through a series of mirrors, a focusing lens and a six inch quartz window.

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