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.

Surface mechanical attrition treatment of low modulus Ti-Nb-Ta-O alloy for orthopedic applications

2020 ◽  
Vol 110 ◽  
pp. 110729 ◽  
Author(s):  
Srijan Acharya ◽  
Arpana Gopi Panicker ◽  
Vasanth Gopal ◽  
Shaurya Singh Dabas ◽  
Geetha Manivasagam ◽  
...  
Keyword(s):  
Surface Mechanical Attrition Treatment ◽  
Mechanical Attrition ◽  
Low Modulus ◽  
Orthopedic Applications

scholarly journals Gradient Microstructure Design in Stainless Steel: A Strategy for Uniting Strength-Ductility Synergy and Corrosion Resistance

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2356
Author(s):  
Qiong He ◽  
Wei Wei ◽  
Ming-Sai Wang ◽  
Feng-Jiao Guo ◽  
Yu Zhai ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Strength ◽  
Back Stress ◽  
High Yield ◽  
Surface Mechanical Attrition Treatment ◽  
Steel Sheets ◽  
Mechanical Attrition ◽  
Gradient Microstructure ◽  
Nano Grains

Martensite transformation and grain refinement can make austenitic stainless steel stronger, but this comes at a dramatic loss of both ductility and corrosion resistance. Here we report a novel gradient structure in 301 stainless steel sheets, which enables an unprecedented combination of high strength, improved ductility and good corrosion resistance. After producing inter-layer microstructure gradient by surface mechanical attrition treatment, the sheet was annealed at high temperature for a short duration, during which partial reverse transformation occurred to form recrystallized austenitic nano-grains in the surface layer, i.e., introducing extra intra-layer heterogeneity. Such 3D microstructure heterogeneity activates inter-layer and inter-phase interactions during deformation, thereby producing back stress for high yield strength and hetero-deformation induced (HDI) hardening for high ductility. Importantly, the recrystallized austenitic nano-grains significantly ameliorates the corrosion resistance. These findings suggest an effective route for evading the strength–ductility and strength–corrosion tradeoffs in stainless steels simultaneously.

Thermal stability and corrosion resistance of nanocrystallized zirconium formed by surface mechanical attrition treatment

2009 ◽  
Vol 24 (10) ◽  
pp. 3136-3145 ◽  
Author(s):  
Yong Han ◽  
Lan Zhang ◽  
Jian Lu ◽  
Wengting Zhang
Keyword(s):  
Thermal Stability ◽  
Grain Size ◽  
Corrosion Resistance ◽  
Grain Growth ◽  
Coarse Grained ◽  
Surface Mechanical Attrition Treatment ◽  
Passive Protection ◽  
Mechanical Attrition ◽  
Nanostructured Layer ◽  
Pure Zirconium

The thermal stability and corrosion behavior of the nanostructured layer on commercially pure zirconium, produced by surface mechanical attrition treatment (SMAT), were investigated. It is indicated that the nanograined Zr is stable at annealing temperatures up to 650 °C, above which significant grain growth occurs and the grain size shows parabolic relationship with annealing time. The activation energy for grain growth of the nanograined Zr is 59 kJ/mol at 750–850 °C, and the grain growth is dominated by grain-boundary diffusion. The as-SMATed nanograined Zr exhibits higher corrosion resistance than the 550–750 °C annealed SMATed Zr and the unSMATed coarse-grained Zr. It is indicated that the corrosion resistance of Zr tends to increase with the reduction of grain size, which is related to the dilution of segregated impurities at grain boundaries due to grain refinement and the formation of passive protection film.

Aluminizing Mechanism and Corrosion Resistance of Pipeline Steel X80 by Combined Pack Cementation Process under Low Temperature

2011 ◽  
Vol 194-196 ◽  
pp. 232-236
Author(s):  
Min Huang ◽  
Yu Wang ◽  
Xiang Hong Lv
Keyword(s):  
Corrosion Resistance ◽  
Low Temperature ◽  
Pipeline Steel ◽  
Element Distribution ◽  
Surface Mechanical Attrition Treatment ◽  
Gradual Change ◽  
Mechanical Attrition ◽  
Pack Aluminizing ◽  
Aluminide Layer ◽  
Pack Cementation Process

In order to improve the corrosion resistance of pipeline steel X80 and maintain its good mechanical properties simultaneously, a low-temperature pack aluminizing process was carried out at 723 K on pipeline steel X80 after a surface mechanical attrition treatment (SMAT). The phase composition, microstructure and element distribution of the as-aluminized pipeline steel X80 were characterized by XRD, SEM and EDS, respectively.The results show that the as-received aluminide layer consists of Fe2Al5, which exhibits a good cohesion with SMATed pipeline steel X80 substrate with the thickness of around 90 μm. The element concentrations of Al and Fe atoms show a gradual change in the range of aluminide layer. After corrosion test processed in 3.5% NaCl solution, there is no obvious corrosion crack or uphills piled up by corrosion products on the surface of as-aluminized SMATed pipeline steel, which can conclude that pack aluminizing assisting by SMAT at low-temperature is an effective way for protecting pipeline steel X80 against corrosion.

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