scholarly journals Enhanced lattice distortion, yield strength, critical resolved shear stress, and improving mechanical properties of transition-metals doped CrCoNi medium entropy alloy

RSC Advances ◽  
2021 ◽  
Vol 11 (38) ◽  
pp. 23719-23724
Author(s):  
Md. Lokman Ali
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
Transition Metals ◽  
Yield Strength ◽  
Lattice Distortion ◽  
Critical Resolved Shear Stress

The effect of transition-metals (TM) addition on the mechanical properties of CrCoNi medium entropy alloys (MEAs) was investigated.

The Interplay of Thermo-Mechanical Properties in the Growth and Processing of III-V Materials

1991 ◽  
Vol 226 ◽  
Author(s):  
A. S. Jordan ◽  
V. Swaminathan
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
Dislocation Density ◽  
Semiconductor Device ◽  
Electronic Devices ◽  
Device Fabrication ◽  
Device Performance ◽  
Bulk Crystals ◽  
Dislocation Generation ◽  
Critical Resolved Shear Stress

AbstractThe thermo-mechanical properties of III-V semiconductors, in general, and of GaAs and InP in particular, are reviewed. They play an important role in many aspects of semiconductor device fabrication starting from the growth of bulk crystals. Dislocation generation in GaAs and InP are discussed with the emphasis on the theoretical and experimental aspects of reducing the dislocation density in these materials. Such mechanical properties as glide systems, critical resolved shear stress and impurity hardening are covered. The effects of dislocations on device performance are illustrated with examples from photonic and electronic devices. Finally, the effect of thermomechanical stresses in the degradation and reliability of GaAs/AlGaAs and InP/InGaAsP based opto-electronic devices is considered.

Activation Volumes in the Yield Strength Anomaly Domain of Ni3(Al,Ta).

1994 ◽  
Vol 364 ◽  
Author(s):  
P. Spätig ◽  
J. Bonneville ◽  
J.-L. Martin
Keyword(s):  
Shear Stress ◽  
Flow Stress ◽  
Yield Strength ◽  
Activation Volume ◽  
Strain Curve ◽  
Rate Sensitivity ◽  
Effective Activation ◽  
Stress Strain Curve ◽  
Controlling Mechanism ◽  
Critical Resolved Shear Stress

AbstractNi3(Al,Ta) single crystals have been deformed in compression in the temperature range of the flow stress anomaly (293–780K). The strain-rate sensitivity (SRS) of the flow stress has been characterised by using a technique of repeated stress relaxations that allows for the measurement of the true (or effective) activation volume (Veff). When measured at the conventional critical resolved shear stress (CRSS), Veff exhibits as a function of temperature a sharp discontinuity close to 470K. When the temperature is held constant (420K), the discontinuity of Veff occurs along the stress-strain curve at approximately 3% strain; the stress for both discontinuities is approximately the same. These results suggest a change in the rate controlling mechanism that is dependent on stress as much or more than temperature.

scholarly journals Effect of rapid Solidification on mechanical properties of free machining lead free aluminum alloys for improved machinability

2017 ◽  
pp. 5155-5166
Author(s):  
Nermin Ali Abdelhakim ◽  
Rizk Mostafa Shalaby ◽  
Mustafa Kamal
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Stress ◽  
Thermal Properties ◽  
Aluminum Alloys ◽  
Yield Strength ◽  
Critical Shear Stress ◽  
Lead Free ◽  
Test Machine ◽  
Melt Spun

There have been very few reports describing the free machining lead free aluminum alloys containing minimal amounts of tin and indium melt spun process. Our paper describes the effect of fundamental factors on the machinability of free machining lead free aluminum alloys rapidly solidified from melt. Structural and thermal properties have been investigated by x-ray diffraction (XRD) and differential scanning calorimetry (DSC) techniques. Tensile test machine used in studies the mechanical properties such as ultimate tensile strength, elastic constants, yield strength and critical shear stress for Al-Zn-Sn-In alloys. It is noticed that mechanical and thermal properties attributed to fine grained structure, reduced levels of segregation and presence of new intermetallic compounds (IMC) such as AlZn and SnZn due to high casting rate by rapid solidification processes. The determination of mechanical properties was suggested to be attributed to the gradual increase of α-Al crystals. We evaluated the tensile properties using tensile test machine of the melt-spun ribbons at varied stress-strain rates to determine the underlying deformation mechanisms .Critical shear stress (CSS) was also calculated .It was found that it is equal to 9.29 GPa for annealed ribbons at 262 0C for 9 hrs. The results showed that several combination of tensile strength ,yield strength ,elastic moduli can be generated from Al- 0.1wt% Zn-1.5 wt% Sn- 1.63 wt% In alloys before and after heat treatment at (262 0C for 3,6,9 hrs) to meet the needs of free machining aluminum alloy applications.                                                                        

scholarly journals Influences of Mo addition on mechanical properties and deformation behavior of β-type Ti alloys

2020 ◽  
Vol 321 ◽  
pp. 05001
Author(s):  
K. Cho ◽  
R. Morioka ◽  
H.Y. Yasuda
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Stress ◽  
Tensile Properties ◽  
Deformation Behavior ◽  
Deformation Twinning ◽  
Compression Tests ◽  
Β Phase ◽  
Ti Alloys ◽  
Critical Resolved Shear Stress

The influences of Mo addition on the tensile properties and deformation behavior of β-type Ti-Mn alloys were investigated with particular focus on {332}<113> deformation twinning. We found that Ti-7Mn and Ti-5Mo-3Mo alloys exhibit completely different tensile properties, despite having the same microstructure and stability of the β phase. The Ti-5Mn-3Mo alloy demonstrates higher tensile strength and larger ductility than the Ti-7Mn alloy due to its strong work hardening, caused by {332} <113> deformation twinning. The critical resolved shear stress (CRSS) for {332}<113> deformation twinning in these alloys was measured by compression tests using single crystals. It was thereby found that Mo addition is effective in decreasing the CRSS for {332}<113> deformation twinning in Ti-Mn alloys.

Effects of Mo Addition on Deformation Behavior of Metastable Beta-Type Ti-Mn Single Crystals

2018 ◽  
Vol 941 ◽  
pp. 1360-1365 ◽  
Author(s):  
Ryota Morioka ◽  
Ken Cho ◽  
Hiroyuki Y. Yasuda
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Shear Stress ◽  
Ultimate Tensile Strength ◽  
Single Crystals ◽  
Deformation Behavior ◽  
Deformation Structures ◽  
Critical Resolved Shear Stress ◽  
Metastable Beta ◽  
First Time

In this study, to clarify the effects of Mo addition on deformation behavior of Ti-Mn alloys, the mechanical properties and the deformation structures of the alloys were investigated using Ti-Mn and Ti-Mn-Mo alloys polycrystals and single crystals. We found that the elongation of Ti-Mn alloys are improved from approximately 5% to 30% by Mo addition, with maintaining ultimate tensile strength of 900 MPa. The excellent strength-ductility balance of Ti-Mn-Mo alloys is caused by {332}<113> twinning, which is unique twinning for metastable β-type titanium alloys. Additionally, the deformation behavior of Ti-Mn and Ti-Mn-Mo alloys was investigated in detail by using single crystals focusing on a critical resolved shear stress (CRSS). As a result, we found for the first time that CRSS for {332}<113> twinning in Ti-Mn-Mo alloy was lower than that in Ti-Mn alloy. Moreover, in Ti-Mn-Mo alloy, CRSS for {332}<113> twinning was lower than that for {112}<111> slip. These results suggest that CRSS for {332}<113> twinning in Ti-Mn alloys is decreased by Mo addition.

THE EFFECT OF ORIENTATION AND IMPURITIES ON THE MECHANICAL PROPERTIES OF MOLYBDENUM SINGLE CRYSTALS

1967 ◽  
Vol 45 (2) ◽  
pp. 1063-1074 ◽  
Author(s):  
D. F. Stein
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
Single Crystals ◽  
Tensile Axis ◽  
Zone Melting ◽  
Hydrogen Gas ◽  
Axis Orientation ◽  
Stereographic Triangle ◽  
Tension And Compression ◽  
Critical Resolved Shear Stress

Molybdenum single crystals containing less than 10 p.p.m. of carbon, 5 p.p.m. of nitrogen, and 5 p.p.m. of oxygen have been prepared by zone melting and hydrogen gas purification. The mechanical properties of the crystals have been measured in tension and compression over a range of temperature from 20 to 298 °K. It was found that the critical resolved shear stress and the temperature dependence of the critical resolved shear stress decreased with increasing purity. It was found that at all test temperatures the CRSS law fails. The critical resolved shear stress is a minimum in the (100) tension axis orientation and reaches a maximum with the tensile axis along the (110)(111) line of the stereographic triangle. It was also found that the ductility of molybdenum single crystals was not improved by purification.

Microstructure Evolution and Property of Austenitic Stainless Steel after ECAP

2012 ◽  
Vol 268-270 ◽  
pp. 291-296
Author(s):  
Li Min Wang ◽  
Zhi Hua Gong ◽  
Gang Yang ◽  
Zheng Dong Liu ◽  
Han Sheng Bao
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Shear Stress ◽  
Austenitic Stainless Steel ◽  
Yield Strength ◽  
Microstructure Evolution ◽  
Ultrafine Grain ◽  
Angular Pressing

Ultrafine-grain or even nano-grain microstructure can be made by equal channel angular pressing (ECAP), mainly resulting from shear strain. The authors experimentally investigated 00Cr18Ni12 austenitic stainless steel and its mechanical properties during and after ECAP. The results showed that because of larger shear stress, many slipping bands occured inside grains, with the increase of pressing pass, the slipping bands may interact with each other to separate slipping bands into sub-grains, finally, the sub-grains transformed into new grains with large angular boundaries. The grain size was about 200nm after the 7th pass. After the 1st and 2nd pass, the tensile strength was higher 93% and 144% than that without ECAP, the yield strength was 5.3 and 6.6 times of that without ECAP respectively.

Tire Treadwear — A Comprehensive Evaluation of the Factors: Generic Type, Aspect Ratio, Tread Pattern, and Tread Composition Part IV: Laboratory Measurement of Mechanical Properties and Mechanical Actions of Tires Relating to Treadwear

1986 ◽  
Vol 14 (4) ◽  
pp. 264-291
Author(s):  
K. L. Oblizajek ◽  
A. G. Veith
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
Contact Zone ◽  
Flexural Rigidity ◽  
Comprehensive Evaluation ◽  
Shear Stiffness ◽  
Shear Stresses ◽  
Lateral Shear ◽  
Band Bending ◽  
Tread Rubber

Abstract Treadwear is explained by specific mechanical properties and actions of tires. Rubber shear stresses in the contact zone between the tire and the road become large at large slip angles. When normal stresses are insufficient to prevent sliding at the rear of the footprint, wear occurs at a rate that depends on test severity. Two experimental approaches are described to relate treadwear to tire characteristics. The first uses transducers imbedded in a simulated road surface to obtain direct measurements of contact stresses on the loaded, freely-rolling, steered tires. The second approach is developed with the aid of a simple carcass, tread-band, tread-rubber tire model. Various tire structural configurations; characterized by carcass spring rate, edgewise flexural band stiffness, and tread rubber shear stiffness; are simulated and lateral shear stress response in the contact zone is determined. Tires featuring high band stiffness and low carcass stiffness generate lower lateral shear stress levels. Furthermore, coupling of tread-rubber stiffness and band flexural rigidity are important in determining level of shear stresses. Laboratory measurements with the described apparatus produced values of tread-band bending and carcass lateral stiffness for several tire constructions. Good correlation is shown between treadwear and a broad range of tire stiffness and test course severities.

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