TEM study of amorphization of Cu and Ti foils by cold-rolling

1990 ◽  
Vol 48 (4) ◽  
pp. 146-147
Author(s):  
W. A. Chiou ◽  
N. L. Jeon ◽  
Genbao Xu ◽  
M. Meshii
Keyword(s):  
Solid State ◽  
Cold Rolling ◽  
High Energy ◽  
Rapid Quenching ◽  
Vapor Condensation ◽  
Metallic Alloys ◽  
Solid State Reactions ◽  
High Energy Particle ◽  
Amorphous Metallic Alloys ◽  
Thin Foils

For many years amorphous metallic alloys have been prepared by rapid quenching techniques such as vapor condensation or melt quenching. Recently, solid-state reactions have shown to be an alternative for synthesizing amorphous metallic alloys. While solid-state amorphization by ball milling and high energy particle irradiation have been investigated extensively, the growth of amorphous phase by cold-rolling has been limited. This paper presents a morphological and structural study of amorphization of Cu and Ti foils by rolling.Samples of high purity Cu (99.999%) and Ti (99.99%) foils with a thickness of 0.025 mm were used as starting materials. These thin foils were cut to 5 cm (w) × 10 cm (1), and the surface was cleaned with acetone. A total of twenty alternatively stacked Cu and Ti foils were then rolled. Composite layers following each rolling pass were cleaned with acetone, cut into half and stacked together, and then rolled again.

Formation of Amorphous Metallic Alloys by Solid-State Reactions

MRS Bulletin ◽  
1986 ◽  
Vol 11 (3) ◽  
pp. 55-58 ◽  
Author(s):  
Ricardo B. Schwarz
Keyword(s):  
Solid State ◽  
Amorphous Alloy ◽  
Rapid Quenching ◽  
Metallic Alloys ◽  
Solid State Reactions ◽  
Undercooled Liquid ◽  
Reaction Products ◽  
Amorphous Metallic Alloys ◽  
New Methods ◽  
Methods Of Synthesis

AbstractFor the last 25 years, amorphous metallic alloys have been prepared by the rapid quenching of melts. Recently, new methods of synthesis based on isothermal solid-state reactions have been developed. It has further been shown that the reaction products can be predicted from free energy diagrams that treat the amorphous alloy as an undercooled liquid. These discoveries have opened new windows to the synthesis of novel metastable materials, both amorphous and crystalline. This paper reviews the basic concepts behind amorphization by solid-state reactions and discusses our current understanding of the nucleation and growth of the amorphous alloy.

HREM study of crystal-amorphous transformation of Cu-Ti multilayers by cold-rolling

1992 ◽  
Vol 50 (1) ◽  
pp. 50-51
Author(s):  
W. A. Chiou ◽  
C. S. Lin ◽  
M. Meshii
Keyword(s):  
Solid State ◽  
Cold Rolling ◽  
Mechanical Alloying ◽  
Structural Transformation ◽  
Amorphous Alloys ◽  
Metallic Alloys ◽  
Solid State Reactions ◽  
Scientific Interest ◽  
Real Process ◽  
Amorphous States

Amorphous alloys have been of scientific interest for more than three decades because of their improved properties (physical, mechanical, magnetic, corrosion, etc.) as compared with those of the same alloys in the crystalline states. Recently, solid-state reactions have been shown to be a potential technology for synthesis of amorphous metallic alloys. While different mechanisms of amorphization have been proposed, the real process is still in debate. To study the amorphization process in more detail, information of structural transformation from crystalline to amorphous states during the processing (e.g., mechanical alloying) is essential. This paper presents an interfacial study of Cu and Ti foils by cold-rolling.

Solid state reactions in Al/Ni alternate foils induced by cold rolling and annealing

1999 ◽  
Vol 47 (6) ◽  
pp. 1901-1914 ◽  
Author(s):  
L. Battezzati ◽  
P. Pappalepore ◽  
F. Durbiano ◽  
I. Gallino
Keyword(s):  
Solid State ◽  
Cold Rolling ◽  
Solid State Reactions ◽  
Cold Rolling And Annealing

Solid-State Transformation Produced by Laser Treatment and Mechanical Alloying of Fe-Ni-Cu(P) Powders

2008 ◽  
Vol 589 ◽  
pp. 391-396
Author(s):  
Szabolcs Herczeg ◽  
János Takács ◽  
Ágnes Csanády ◽  
Gyula Kakuk ◽  
Jenő Sólyom ◽  
...  
Keyword(s):  
Solid State ◽  
Mechanical Alloying ◽  
Laser Scanning ◽  
Scanning Speed ◽  
High Energy ◽  
Laser Sintering ◽  
Solid State Reactions ◽  
State Transformation ◽  
Solid State Transformation ◽  
Laser Scanning Speed

The comparison of the phase transformations going on due to high energy ball milling (HEBM) and produced by pressure-less Direct Metal Laser Sintering (DMLS developed by EOS company) was carried out, by using an α-Fe, Ni and Cu3P powder mixture. It could be shown by X-ray diffractograms (XRD) of the two type of products, that by mechanical alloying a similar phase transformation occurs due to solid state reactions between the metal partners as in the case of laser sintering, in a given range of laser scanning speed in a laboratory laser equipment. According to the XRD evaluation the same metastable, γ-steel like phases were formed.

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