Effect of boron carbide nano particles in CuSi4Zn14 silicone bronze nanocomposites on matrix powder surface morphology and structural evolution via mechanical alloying

2019 ◽  
Vol 45 (3) ◽  
pp. 3492-3501 ◽  
Author(s):  
R. Clinktan ◽  
V. Senthil ◽  
K.R. Ramkumar ◽  
S. Sivasankaran ◽  
Fahad A. Al-Mufadi
Keyword(s):  
Surface Morphology ◽  
Mechanical Alloying ◽  
Boron Carbide ◽  
Structural Evolution ◽  
Nano Particles ◽  
Powder Surface ◽  
Matrix Powder

scholarly journals Dislocation-mediated shear amorphization in boron carbide

2021 ◽  
Vol 7 (8) ◽  
pp. eabc6714 ◽  
Author(s):  
Kolan Madhav Reddy ◽  
Dezhou Guo ◽  
Shuangxi Song ◽  
Chun Cheng ◽  
Jiuhui Han ◽  
...  
Keyword(s):  
Boron Carbide ◽  
Structural Transition ◽  
Activation Volume ◽  
Structural Evolution ◽  
Dislocation Nucleation ◽  
Superhard Materials ◽  
Rate Dependent ◽  
Transmission Electron ◽  
Lower Activation ◽  
Underlying Mechanisms

The failure of superhard materials is often associated with stress-induced amorphization. However, the underlying mechanisms of the structural evolution remain largely unknown. Here, we report the experimental measurements of the onset of shear amorphization in single-crystal boron carbide by nanoindentation and transmission electron microscopy. We verified that rate-dependent loading discontinuity, i.e., pop-in, in nanoindentation load-displacement curves results from the formation of nanosized amorphous bands via shear amorphization. Stochastic analysis of the pop-in events reveals an exceptionally small activation volume, slow nucleation rate, and lower activation energy of the shear amorphization, suggesting that the high-pressure structural transition is activated and initiated by dislocation nucleation. This dislocation-mediated amorphization has important implications in understanding the failure mechanisms of superhard materials at stresses far below their theoretical strengths.

Structural evolution in mechanical alloying of Co and B powders

1992 ◽  
Vol 150 (1-3) ◽  
pp. 487-490 ◽  
Author(s):  
A. Corrias ◽  
G. Ennas ◽  
G. Marongiu ◽  
A. Musinu ◽  
G. Paschina
Keyword(s):  
Mechanical Alloying ◽  
Structural Evolution

SYNTHESIS OF NANO-CRYSTALLINE Cu-Cr ALLOY BY MECHANICAL ALLOYING

2012 ◽  
Vol 05 ◽  
pp. 496-501 ◽  
Author(s):  
S. SHEIBANI ◽  
S. HESHMATI-MANESH ◽  
A. ATAIE
Keyword(s):  
Mechanical Alloying ◽  
Structural Evolution ◽  
High Energy ◽  
Lattice Parameter ◽  
Control Agent ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Nano Crystalline ◽  
High Energy Ball Mill ◽  
Energy Ball

In this paper, the influence of toluene as the process control agent (PCA) and pre-milling on the extension of solid solubility of 7 wt.% Cr in Cu by mechanical alloying in a high energy ball mill was investigated. The structural evolution and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques, respectively. The solid solution formation at different conditions was analyzed by copper lattice parameter change during the milling process. It was found that both the presence of PCA and pre-milling of Cr powder lead to faster dissolution of Cr . The mean crystallite size was also calculated and showed to be about 10 nm after 80 hours of milling.

Structural evolution and formation mechanisms of TiC/Ti nanocomposites prepared by high-energy mechanical alloying

2010 ◽  
Vol 43 (13) ◽  
pp. 135402 ◽  
Author(s):  
Dongdong Gu ◽  
Wilhelm Meiners ◽  
Yves-christian Hagedorn ◽  
Konrad Wissenbach ◽  
Reinhart Poprawe
Keyword(s):  
Mechanical Alloying ◽  
Structural Evolution ◽  
High Energy ◽  
Formation Mechanisms

Structural evolution of the Ti70Ni15Al15 powders prepared by mechanical alloying

2001 ◽  
Vol 300 (1-2) ◽  
pp. 148-152 ◽  
Author(s):  
K.B. Kim ◽  
S. Yi ◽  
S.H. Kim ◽  
W.T. Kim ◽  
D.H. Kim
Keyword(s):  
Mechanical Alloying ◽  
Structural Evolution
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