다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

High entropy alloys: A focused review of mechanical properties and deformation mechanisms

Structural rearrangements are an essential property of atomic and molecular glasses; they are critical in controlling resistance to flow and are central to the evolution of many properties of glasses, such as their heat capacity and dielectric constant. Despite their importance, these rearrangements cannot directly be visualized in atomic glasses. We used a colloidal glass to obtain direct three-dimensional images of thermally induced structural rearrangements in the presence of an applied shear. We identified localized irreversible shear transformation zones and determined their formation energy and topology. A transformation favored successive ones in its vicinity. Using continuum models, we elucidated the interplay between applied strain and thermal fluctuations that governs the formation of these zones in both colloidal and molecular glasses.

http://absimage.aps.org/image/MAR11/MWS_MAR11-2010-008328.pdf

Structural rearrangements that govern flow in colloidal glasses

Mechanical behavior of high-entropy alloys

The files uploaded here constitute the raw data files for the experimental results presented in the paper named above. SEM BSE images and EDX maps are provided. TEM BF images and SADPs are also provided. Some additional SEM EDX maps are given, which were not presented in the paper, that further support the statements made in the paper. The raw .dm3 picture files generated from the Osiris microscope are available. Raw INCA .ipj files are also included. Readme files are included in where appropriate.
 
The dataset will be updated with publication details.
 
The article associated with this dataset can be found on the Cambridge University Repository at https://www.repository.cam.ac.uk/handle/1810/251467

Research data supporting: "Precipitation in the Equiatomic High-Entropy Alloy CrMnFeCoNi"

Influence of modulus-to-hardness ratio and harmonic parameters on continuous stiffness measurement during nanoindentation

Nanoindentation testing as a powerful screening tool for assessing phase stability of nanocrystalline high-entropy alloys

Nanoindentation became a versatile tool for testing local mechanical properties beyond hardness and modulus. By adapting standard nanoindentation test methods, simple protocols capable of probing thermally activated deformation processes can be accomplished. Abrupt strain-rate changes within one indentation allow determining the strain-rate dependency of hardness at various indentation depths. For probing lower strain-rates and excluding thermal drift influences, long-term creep experiments can be performed by using the dynamic contact stiffness for determining the true contact area. From both procedures hardness and strain-rate, and consequently strain-rate sensitivity and activation volume can be reliably deducted within one indentation, permitting information on the locally acting thermally activated deformation mechanism. This review will first discuss various testing protocols including possible challenges and improvements. Second, it will focus on different examples showing the direct influence of crystal structure and/or microstructure on the underlying deformation behavior in pure and highly alloyed material systems.

/pdf/advanced-nanoindentation-testing-for-studying-strain-rate-4cbd0r1rfc.pdf

Verena Maier-Kiener

Papers

Influence of modulus-to-hardness ratio and harmonic parameters on continuous stiffness measurement during nanoindentation

Nanoindentation testing as a powerful screening tool for assessing phase stability of nanocrystalline high-entropy alloys

Advanced Nanoindentation Testing for Studying Strain-Rate Sensitivity and Activation Volume.

Grain boundary segregation engineering in as-sintered molybdenum for improved ductility

Essential refinements of spherical nanoindentation protocols for the reliable determination of mechanical flow curves