Hardening mechanisms of hard gold

1979 ◽  
Vol 50 (11) ◽  
pp. 6887-6891 ◽  
Author(s):  
C. C. Lo ◽  
J. A. Augis ◽  
M. R. Pinnel
Keyword(s):  
Hardening Mechanisms ◽  
Hard Gold

High-protein nutrition bars: Hardening mechanisms and anti-hardening methods during storage

Food Control ◽  
2021 ◽  
pp. 108127
Author(s):  
Zhanmei Jiang ◽  
Kaili Wang ◽  
Xu Zhao ◽  
Jinpeng Li ◽  
Rui Yu ◽  
...  
Keyword(s):  
High Protein ◽  
Protein Nutrition ◽  
Hardening Mechanisms

Improvement of Method and Mechanism for Conical and Paraboloid Springs Hardening

2021 ◽  
Vol 1037 ◽  
pp. 227-232
Author(s):  
Nikita A. Zemlyanushnov ◽  
Nadezhda Y. Zemlyanushnova
Keyword(s):  
New Method ◽  
Cylindrical Shape ◽  
Plastic Deformations ◽  
Conical Shape ◽  
Inner Surface ◽  
Hardening Mechanisms ◽  
The Difference ◽  
Compression Springs

The disadvantage of the known methods of hardening springs is the impossibility of their use when hardening springs of a conical shape or of a shape of a paraboloid of rotation, since they are intended only for cylindrical shape springs and are not suitable for conical shape springs or those of a shape of a paraboloid of rotation specifically because of the difference in the shape of the springs. One of the disadvantages of the known springs hardening mechanisms is the impossibility of hardening the inner surface of the conical compression springs. A new method of hardening springs is proposed, the unmatched advantage of which is the ability to create plastic deformations on the inner and outer surfaces of the spring coils compressed to contact and on the surfaces along the line of contact between the coils. A new advantageous mechanism for hardening springs is proposed, which makes it possible to harden the inner surface of compression springs having a conical shape or a paraboloid shape of rotation, in a compressed state.

Hardening mechanisms of high pressure Mg-Li alloys

2014 ◽  
Vol 115 (2) ◽  
pp. 023511 ◽  
Author(s):  
Qiuming Peng ◽  
Wenshi Wu ◽  
Jianxin Guo ◽  
Jianyong Xiang ◽  
S. S. Zhao
Keyword(s):  
High Pressure ◽  
Hardening Mechanisms

scholarly journals Dislocation behaviors in nanotwinned diamond

2018 ◽  
Vol 4 (9) ◽  
pp. eaat8195 ◽  
Author(s):  
Jianwei Xiao ◽  
Huizhen Yang ◽  
Xiaozhi Wu ◽  
Fatima Younus ◽  
Peng Li ◽  
...  
Keyword(s):  
High Hardness ◽  
Dislocation Nucleation ◽  
Frictional Stress ◽  
High Activation ◽  
Reaction Heat ◽  
Two Factors ◽  
Heat Activation ◽  
Hardening Mechanisms ◽  
Twin Thickness ◽  
Good Agreement

Experimental results (Huang et al.) indicated that nanotwinned diamond (nt-diamond) has unprecedented hardness, whose physical mechanism has remained elusive. In this report, we categorize interaction modes between dislocations and twin planes in nt-diamond and calculate the associated reaction heat, activation energies, and barrier strength using molecular dynamics. On the basis of the Sachs model, twin thickness dependence of nt-diamond hardness is evaluated, which is in good agreement with the experimental data. We show that two factors contribute to the unusually high hardness of nt-diamond: high lattice frictional stress by the nature of carbon bonding in diamond and high athermal stress due to the Hall-Petch effect. Both factors stem from the low activation volumes and high activation energy for dislocation nucleation and propagation in diamond twin planes. This work provides new insights into hardening mechanisms in nt-diamond and will be helpful for developing new superhard materials in the future.

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