Preparation of Cu-Al-Nb shape memory alloys by high energy ball milling and powder metallurgy

2003 ◽  
Vol 112 ◽  
pp. 579-582
Author(s):  
M. C.A. da Silva ◽  
C. J. Araujol ◽  
R. E. Coelho ◽  
T. A.A. Melo ◽  
R. M. Gomes ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

High-Energy Ball Milling Conditions in Formation of NiTiCu Shape Memory Alloys

2021 ◽  
pp. 1-7
Author(s):  
Tomasz Goryczka ◽  
Piotr Salwa ◽  
Maciej Zubko
Keyword(s):  
Chemical Composition ◽  
Shape Memory ◽  
Crystallite Size ◽  
Ball Milling ◽  
Average Crystallite Size ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball ◽  
Average Size ◽  
Grinding Time

The properties and the shape memory effect depend, among other things, on chemical composition, as well as the method of shape memory alloy (SMA) production. One of the manufacturing methods that leads to the amorphous/nanocrystalline SMA is high-energy ball milling combined with annealing. Using this technique, an SMA memory alloy, with the nominal chemical composition of Ni25Ti50Cu25, was produced from commercial elemental powders (purity −99.7%). The structure and morphology were characterized (at the various stages of its production) by the use of X-ray diffraction, as well as electron microscopy (both scanning and transmission). Choosing the appropriate grinding time made it possible to produce an NiTiCu alloy with a different crystallite size. Its average size changed from 6.5 nm (after 50 h) to about 2 nm (100 h). Increasing the grinding time up to 140 h resulted in the formation of areas that showed the B19 martensite and the Ti2(Ni,Cu) phase with the average crystallite size of about 6 nm (as milled). After crystallization, the average size increased to 11 nm.

scholarly journals Study of the AISI 52100 Steel Reuse Through the Powder Metallurgy Route Using High Energy Ball Milling

2017 ◽  
Vol 21 (1) ◽  
Author(s):  
Bruna Horta Bastos Kuffner ◽  
Gilbert Silva ◽  
Carlos Alberto Rodrigues ◽  
Geovani Rodrigues
Keyword(s):  
Powder Metallurgy ◽  
Ball Milling ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Aisi 52100 ◽  
Aisi 52100 Steel ◽  
Energy Ball ◽  
Powder Metallurgy Route

Interface Reaction of CNTs/Al Composites Fabricated by High Energy Ball Milling

2013 ◽  
Vol 750-752 ◽  
pp. 90-94 ◽  
Author(s):  
Gang Yue ◽  
Xiao Lan Cai ◽  
Kai Jun Wang ◽  
Hong Peng Sun ◽  
Ya Guang Chen
Keyword(s):  
Powder Metallurgy ◽  
Ball Milling ◽  
Interface Reaction ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Appreciable Amount ◽  
Preparation Process ◽  
Composite Powders ◽  
Thermodynamics And Kinetics ◽  
Energy Ball

CNTs/Al composites were fabricated by high energy ball milling. The phase structure and consti- tuent of the preparation process were analyzed. The interface reaction and the formation process of the interface reaction product Al4C3were discussed by thermodynamics and kinetics. The result shows that no Al4C3can be found in Al-CNTs composite powders fabricated by high energy ball milling. Al4C3exists in the inter- face after pressureless sintering. And no appreciable amount of Al4C3was observed in CNTs/Al composites directly by powder metallurgy. It shows that high energy ball milling can benifit the interface reaction. And the purified CNTs, never milled, is stable in the preparation process of CNTs/Al composites by powder metallurgy.

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