scholarly journals Effects of the Rare Earth Y on the Structural and Tensile Properties of Mg-based Alloy: A First-Principles Study

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1003
Author(s):  
Yan Gao ◽  
Chuang Wu ◽  
Wenjiang Feng ◽  
Yan He ◽  
Haisheng He ◽  
...  
Keyword(s):  
Rare Earth ◽  
Strain Curve ◽  
Strain Range ◽  
Strengthening Mechanism ◽  
Stress And Strain ◽  
Strengthening Effect ◽  
Solution Structures ◽  
Calculation Results ◽  
Cohesive Energies ◽  
The Rare Earth

In order to investigate the effect of the rare earth element Y on the strengthening potency of magnesium alloys and its strengthening mechanism under tension. In this paper, the solid solution structures with Y atom content of 1.8 at.% and 3.7 at.% were built, respectively, and their cohesive energies and stress-strain curve were calculated in the strain range of 0–20%. The calculation results of the cohesive energies showed that the structure of element Y is more stable with the increase of strains. The calculation results of stress and strain showed that Y element can improve the yield strength and tensile strength of the Mg-based alloy, and the strengthening effect is better when the Y content is 3.7 at.%.

Effects of Rare Earth Elements on the Quality of Nugget in Aluminum Alloy Spot Welding

2010 ◽  
Vol 160-162 ◽  
pp. 796-801
Author(s):  
Jian Tao Dong ◽  
Zhen Luo ◽  
Lin Shu Zhou ◽  
Jian Hao
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Spot Welding ◽  
Strengthening Mechanism ◽  
Optical Microscope ◽  
Second Phase ◽  
Punch Test ◽  
Fine Grain ◽  
Dislocation Movement ◽  
The Rare Earth

The strength and microstructure characteristics of the nugget in aluminum ally resistance spot welding were evaluated in this study with and without addition of rare earth elements Er, Ce. The strength was assessed using a small punch test mode and the microstructure was studied using an optical microscope, scanning electron microscope, and energy-dispersive spectroscope. Results indicated that the hardness and strength were increased about 10% after adding rare earth elements Er, Ce in the nugget. The grain of nugget zone was refined significantly. In the boundary and interior of the grain, a number of rare elements and its compounds were dispersed. This showed that parts of rare earth elements existed as solid solution in Al Matrix, part as the rare earth compounds. This improved that the elements not only can promote nucleation and refinement, but also can inhibit plastic deformation by hindering the dislocation movement. Thus they could play a strengthened role. The strengthening mechanism of the rare earth elements Er, Ce in the alloy nugget is mainly the second phase strengthening and fine grain strengthening.

Fatigue Analysis in Pressure Vessel Design by Local Strain Approach: Methods and Software Requirements

2004 ◽  
Author(s):  
Arturs Kalnins
Keyword(s):  
Pressure Vessel ◽  
Equivalent Stress ◽  
Hysteresis Loops ◽  
Strain Curve ◽  
Strain Range ◽  
Local Strain ◽  
Fatigue Analysis ◽  
Software Requirements ◽  
Stress And Strain ◽  
Stress Strain

The purpose, methods for the analysis, software requirements, and meaning of the results of the local strain approach for fatigue analysis in pressure vessel design is discussed. Three methods that are consistent with the approach are evaluated, based on the requirement that the calculated stress-strain behavior of a stabilized cycle in a pressure vessel component offers a valid comparison with that of the smooth specimens used to develop the cyclic stress-strain curve of the material. Software that can produce results consistent with the approach is identified. The question of the kind of multiaxial equivalent strain range that should be used in the local strain approach is addressed and answered. The concept of a multiaxial equivalent hysteresis loop, which replaces multiple hysteresis loops between stress and strain components, is developed. Its purpose is to determine the multiaxial equivalent stress and strain ranges that are consistent with the local strain approach.

Flame spectra of the rare-earth elements*

1962 ◽  
Vol 18 (4) ◽  
pp. 1127-1153
Author(s):  
V FASSEL ◽  
R CURRY ◽  
R KNISELEY
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
The Rare Earth

Physico-chemical properties of the rare-earth metals, scandium, and yttrium

1963 ◽  
Vol 79 (2) ◽  
pp. 263-293 ◽  
Author(s):  
E.M. Savitskii ◽  
V.F. Terekhova ◽  
O.P. Naumkin
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Chemical Properties ◽  
Physico Chemical ◽  
The Rare Earth

Effect of pipe expansion on the redistribution of residual stresses after molding

2020 ◽  
Vol 10 (2) ◽  
pp. 122-126
Author(s):  
Nikolay A. Makhutov ◽  
◽  
Dmitry A. Neganov ◽  
Eugeny P. Studenov ◽  
◽  
...  
Keyword(s):  
Residual Stresses ◽  
Strain Distribution ◽  
Strain State ◽  
Stress And Strain ◽  
Cylindrical Shape ◽  
Pipe Material ◽  
Pipe Expansion ◽  
Calculation Results ◽  
Residual Deformations ◽  
Stress And Strain Distribution

In the factory, pipes for trunk oil and oil product pipelines are obtained by molding and welding. To ensure a cylindrical shape and reduce technological residual stresses, expansion technology is used. Pipe expansion causes a significant change in the values of residual deformations and stresses. The article presents both the calculation results and graphs regarding stress and strain distribution during bending of the stock and their redistribution after expansion. Based on the calculation results, the final total values of residual stresses and residual deformations caused by bending and expansion were stated to be important components of the stress-strain state observed in pipelines being operated under cyclic loading, as well as those used in assessing how degradation affects the ductility of the pipe material. These factors were concluded as being reasonably taken into account when performing verification calculations regarding long-running pipelines if, based on their diagnostics and analysis, their state does not meet modern strength requirements.

DETERMINATION OF THE RARE EARTH METALS IN THE RED MUD FOR POSSIBLE UTILIZATION

2018 ◽  
Vol 17 (8) ◽  
pp. 2001-2009
Author(s):  
Tatjana Juzsakova ◽  
Akos Redey ◽  
Le Phuoc Cuong ◽  
Zsofia Kovacs ◽  
Tamas Frater ◽  
...  
Keyword(s):  
Rare Earth ◽  
Red Mud ◽  
Rare Earth Metals ◽  
The Rare Earth
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