Surface hardening of high- and medium-entropy alloys by mechanical attrition at room and cryogenic temperatures

2021 ◽  
Vol 119 (20) ◽  
pp. 201912
Author(s):  
Marc Novelli ◽  
Robert Chulist ◽  
Werner Skrotzki ◽  
Easo P. George ◽  
Thierry Grosdidier
Keyword(s):  
Surface Hardening ◽  
Cryogenic Temperatures ◽  
Mechanical Attrition

scholarly journals Mechanical and electrochemical response in Surface treated low modulus biomedical alloy Ti-Nb-Ta-O

2020 ◽  
Vol 321 ◽  
pp. 05014
Author(s):  
Srijan Acharya ◽  
Shaurya Singh Dabas ◽  
Satyam Suwas ◽  
Kaushik Chatterjee
Keyword(s):  
Corrosion Resistance ◽  
Surface Hardening ◽  
Surface Mechanical Attrition Treatment ◽  
Degree Of Deformation ◽  
Peak Broadening ◽  
Mechanical Attrition ◽  
Mechanical Methods ◽  
Low Modulus ◽  
Biomedical Alloy ◽  
Stable Passive

Surface modification of metallic biomedical implants are often performed using chemical or mechanical methods in order to make them more bio-active or resistant against surface-induced phenomena such as wear, corrosion or corrosion fatigue. In the present study, one such method, known as Surface Mechanical Attrition Treatment (SMAT), has been studied in terms of its effects on the mechanical and functional response of a newly developed low modulus metastable β Ti-Nb-Ta-O alloy. The hardness of the surface was found to increase up to a certain duration of SMAT, due to increased degree of deformation on the surface. This was also supported by an increase in the peak broadening with respect to SMAT duration. Apart from surface hardening, SMAT also resulted in improvement of corrosion resistance of the Ti-Nb-Ta-O alloy due to formation of a more stable passive film.

Cryogenic atomic force microscopy

1991 ◽  
Vol 49 ◽  
pp. 54-55
Author(s):  
K. A. Fisher ◽  
M. G. L. Gustafsson ◽  
M. B. Shattuck ◽  
J. Clarke
Keyword(s):  
Room Temperature ◽  
Rapid Freezing ◽  
Cryogenic Temperatures ◽  
Soft Or ◽  
Electrically Conductive ◽  
Force Microscopy ◽  
Flexible Molecules ◽  
Advantages And Disadvantages ◽  
Atomic Force ◽  
Chemical Perturbation

The atomic force microscope (AFM) is capable of imaging electrically conductive and non-conductive surfaces at atomic resolution. When used to image biological samples, however, lateral resolution is often limited to nanometer levels, due primarily to AFM tip/sample interactions. Several approaches to immobilize and stabilize soft or flexible molecules for AFM have been examined, notably, tethering coating, and freezing. Although each approach has its advantages and disadvantages, rapid freezing techniques have the special advantage of avoiding chemical perturbation, and minimizing physical disruption of the sample. Scanning with an AFM at cryogenic temperatures has the potential to image frozen biomolecules at high resolution. We have constructed a force microscope capable of operating immersed in liquid n-pentane and have tested its performance at room temperature with carbon and metal-coated samples, and at 143° K with uncoated ferritin and purple membrane (PM).

SANDMEYER SSC INVAR 36

Alloy Digest ◽  
2012 ◽  
Vol 61 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Coefficient Of Thermal Expansion ◽  
Iron Alloy ◽  
Gas Production ◽  
Liquefied Natural Gas ◽  
Cryogenic Temperatures ◽  
Steel Company ◽  
Nickel Iron ◽  
Composite Tooling ◽  
Nickel Iron Alloy

Abstract SSC Invar 36 was developed for use in applications where dimensional stability is essential. It is a nickel-iron alloy with a very low coefficient of thermal expansion from cryogenic temperatures to 200 deg C (390 deg F). It is utilized in aerospace composite tooling and die applications, as well as laser components, and cryogenic components and piping: liquefied natural gas production, storage, and transportation. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on corrosion resistance as well as forming. Filing Code: Fe-158. Producer or source: Sandmeyer Steel Company. Originally published December 2011, revised February 2012.

INCONEL ALLOY X-750

Alloy Digest ◽  
1966 ◽  
Vol 15 (7) ◽  
Keyword(s):  
Gas Turbines ◽  
Rupture Strength ◽  
Low Cost ◽  
High Strength ◽  
Heat Treating ◽  
Chromium Alloy ◽  
Cryogenic Temperatures ◽  
Inconel Alloy ◽  
Nickel Chromium ◽  
Corrosion And Oxidation

Abstract INCONEL alloy X-750 is an age-hardenable, nickel-chromium alloy used for its corrosion and oxidation resistance and high creep rupture strength at temperature up to 1500 F. It also has excellent properties at cryogenic temperatures. It was originally developed for use in gas turbines, but because of its low cost, high strength and weldability it has become the standards choice for a wide variety of applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep and fatigue. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-115. Producer or source: Huntington Alloy Products Division, An INCO Company.

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