The Influence of SMAT and Polishing on the Degradation of AZ31B Magnesium Alloy in 3.5 Wt.% NaCl Solution

2020 ◽  
Vol 840 ◽  
pp. 377-382
Author(s):  
Budi Arifvianto ◽  
Muslim Mahardika ◽  
Urip Agus Salim ◽  
Suyitno Suyitno
Keyword(s):  
Potential Surface ◽  
Ph Monitoring ◽  
Immersion Test ◽  
Mg Alloy ◽  
Surface Mechanical Attrition Treatment ◽  
Material Surface ◽  
Nacl Solution ◽  
Promising Technique ◽  
Weight Losses ◽  
Mechanical Attrition

Surface mechanical attrition treatment (SMAT) has been recognized as a potential surface treatment for improving the strength and the wear resistance of magnesium (Mg) and its alloy. However, this treatment potentially increases the degradation rate of these particular materials. Therefore, additional treatments might be needed to overcome such limitation of the SMAT. In this research, the influence of polishing on the degradation of the SMAT-processed AZ31B Mg alloy was investigated. Weight losses measurement and pH monitoring were carried out to determine degradation behavior of the Mg alloy during an immersion test in 3.5 wt.% NaCl solution. The results showed that the degradability of the Mg alloy decreased with the application of polishing to remove the rough surface layer and the Fe contaminant on the material surface generated by the SMAT. Based on all the findings in this work, it can be concluded that the SMAT is indeed a promising technique for lowering the degradability of AZ31B Mg alloy, but such an advantage was masked by the increased roughness and contamination of the alloy surface with this treatment.

Degradation of Mechanically Surface Treated AZ31B Magnesium Alloy in 3.5 wt.% NaCl Solution

2019 ◽  
Vol 948 ◽  
pp. 237-242 ◽  
Author(s):  
Budi Arifvianto ◽  
Suyitno ◽  
Muslim Mahardika
Keyword(s):  
Magnesium Alloy ◽  
Immersion Test ◽  
Mg Alloy ◽  
Surface Mechanical Attrition Treatment ◽  
Degradation Behavior ◽  
Nacl Solution ◽  
Az31b Magnesium Alloy ◽  
Mechanical And Tribological Properties ◽  
Weight Losses ◽  
Mechanical Attrition

Surface mechanical attrition treatment (SMAT) has so far been used as a technique for improving mechanical and tribological properties of magnesium and its alloys. However, the effects of the SMAT on corrosion and degradability of these materials are still rarely reported in open literature. In this research, the degradation behavior of AZ31B magnesium alloy after receiving the SMAT was characterized. The degradation behavior of the Mg alloy was determined from the weight losses after an immersion test for 24 h in 3.5 wt.% NaCl solution. During the test, the pH of the solution was also monitored. The results obviously showed higher corrosion rates of the Mg alloy that had been treated by using the SMAT. Interestingly, the degradation rate of the Mg alloy decreased once a longer duration of SMAT was applied. Meanwhile, the pH of NaCl solution increased up to 12 and 13.9 once the non-treated and the SMAT specimens were immersed into the solution, respectively. In addition, the energy dispersive X-ray spectroscopy (EDS) analysis confirmed the presence of corrosion products in all the Mg samples that were similar to those revealed in the literature.

The deformation behavior of AZ31 Mg alloy with surface mechanical attrition treatment

2017 ◽  
Vol 707 ◽  
pp. 636-646 ◽  
Author(s):  
Xiangchen Meng ◽  
Meng Duan ◽  
Lan Luo ◽  
Duochan Zhan ◽  
Bin Jin ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
Mg Alloy ◽  
Surface Mechanical Attrition Treatment ◽  
Mechanical Attrition ◽  
Az31 Mg Alloy

Electron Backscatter Diffraction and Transmission Kikuchi Diffraction Analysis of an Austenitic Stainless Steel Subjected to Surface Mechanical Attrition Treatment and Plasma Nitriding

2015 ◽  
Vol 21 (4) ◽  
pp. 919-926 ◽  
Author(s):  
Gwénaëlle Proust ◽  
Delphine Retraint ◽  
Mahdi Chemkhi ◽  
Arjen Roos ◽  
Clemence Demangel
Keyword(s):  
Stainless Steel ◽  
Surface Properties ◽  
Electron Backscatter Diffraction ◽  
Plasma Nitriding ◽  
Surface Mechanical Attrition Treatment ◽  
Material Surface ◽  
Mechanical Attrition ◽  
Electron Backscatter ◽  
Nanocrystalline Layer ◽  
Backscatter Diffraction

AbstractAustenitic 316L stainless steel can be used for orthopedic implants due to its biocompatibility and high corrosion resistance. Its range of applications in this field could be broadened by improving its wear and friction properties. Surface properties can be modified through surface hardening treatments. The effects of such treatments on the microstructure of the alloy were investigated here. Surface Mechanical Attrition Treatment (SMAT) is a surface treatment that enhances mechanical properties of the material surface by creating a thin nanocrystalline layer. After SMAT, some specimens underwent a plasma nitriding process to further enhance their surface properties. Using electron backscatter diffraction, transmission Kikuchi diffraction, energy dispersive spectroscopy, and transmission electron microscopy, the microstructural evolution of the stainless steel after these different surface treatments was characterized. Microstructural features investigated include thickness of the nanocrystalline layer, size of the grains within the nanocrystalline layer, and depth of diffusion of nitrogen atoms within the material.

Thermal Stability of Nanocrystallized Surface Layer in Al-Zn-Mg Alloy by Surface Mechanical Attrition Treatment

2007 ◽  
Vol 546-549 ◽  
pp. 1129-1134 ◽  
Author(s):  
Jin Fang Ma ◽  
Lan Qing Hu ◽  
Xu Guang Liu ◽  
Bing She Xu
Keyword(s):  
Thermal Stability ◽  
Grain Size ◽  
Surface Layer ◽  
Boundary Migration ◽  
Mg Alloy ◽  
Surface Mechanical Attrition Treatment ◽  
Mechanical Attrition ◽  
Nanostructured Layer ◽  
Average Grain Size ◽  
Thermal Stability Of

After surface mechanical attrition treatment (SMAT) for Al-Zn-Mg alloy, a gradient structure with average grain size increased from 20nm in surface layer to about 100nm at a depth of 20μm was formed. The thermal stability of surface nanostructured layer in Al-Zn-Mg alloy samples was investigated by vacuum annealing at 100°C, 150°C, 200°C and 250°C for 1h, respectively. The microstructural evolution as well as the microhardness along the depth from top surface layer to matrix of SMATed samples was analyzed. Experimental results showed that the grain size of surface nanocrystallites remains in submicro-scale, ranging from 300nm to 400nm, when annealed at a temperature of 250°C, and the microhardness of surface nanostructured layer was still high compared with that of matrix, indicating satisfying thermal stability of nanocrystallized layer. This might be attributed to the presence of substantive trident grain boundaries and pinning effect of dispersive precipitated phases in nanocrystalline materials, which hindered the grain boundary migration that leading to grain growth.

Sign in / Sign up

Export Citation Format

Share Document