An investigation on the hardness and corrosion behavior of MWCNT/Mg composites and grain refined Mg

Saikrishna, N.; Reddy, G. Pradeep Kumar; Munirathinam, Balakrishnan; Dumpala, Ravikumar; Jagannatham, M.; Sunil, B. Ratna

doi:10.1016/j.jma.2017.12.003

Cited by 55 publications

(40 citation statements)

References 26 publications

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“…This is similar to earlier findings in which altered peak intensities in AZ31 magnesium alloy and AZ91 magnesium alloy was associated with texture development due to friction stir processing. The material flow during friction stir processing around the tool pin surface beneath the shoulder favors to develop basal dominated texture in magnesium alloys [13, 19, 20]. In the present work, a significant change in the x‐ray diffraction peak intensities of ZE41 magnesium alloy after friction stir processing suggests the similar kind of microstructure in the friction stir processed ZE41.…”

Section: Resultssupporting

confidence: 50%

Mechanical behavior and wear characteristics of fine grained ZE41 magnesium alloy

Babu

Babu²,

Janardhana

2021

Materialwissenschaft Werkst

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ZE41 magnesium alloy was successfully produced by friction stir processing and grain refinement was achieved from a starting size of 107 μm±6.7 μm to 3.5 μm±1.5 μm. MgZn intermetallic which was appeared as network like structure at the grain boundaries before friction stir processing was greatly affected due to the severe plastic deformation and broken as small particles as observed from the microstructural studies. Higher hardness (≈30 %) was measured for the fine grained ZE41 magnesium alloy compared with the base alloy due to the grain refinement. From the tensile tests, yield strength and ultimate tensile strength was significantly increased at the cost of decreased ductility reflected in lower strain for the fine grained ZE41 compared with the base alloy. Wear studies showed higher coefficient of friction and lower mass loss for the grain refined ZE41 magnesium alloy. From the results, it can be understood that the grain refinement achieved by friction stir processing has a profound influence on enhancing the mechanical and tribological properties of ZE41 magnesium alloy.

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Section: Resultssupporting

confidence: 50%

Mechanical behavior and wear characteristics of fine grained ZE41 magnesium alloy

Babu

Babu²,

Janardhana

2021

Materialwissenschaft Werkst

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“…From a starting average grain size of 166.5 μm±8.7 μm, grain refinement was achieved up to 8.77 μm±1.3 μm in AZ91 magnesium alloy after friction stir processing. The stir zone shows the distribution of grain size at two different scales (bimodal grain size distribution) which includes a combination of fine and very fine grains as usually observed in friction stir processing of magnesium alloys [19, 31, 32]. Additionally, large eutectic regions which are a common observation in cast AZ91 magnesium alloy were disappeared after friction stir processing.…”

Section: Resultsmentioning

confidence: 92%

“…Additionally, a significant change in the intensities of the peaks corresponding to magnesium in the composite compared with base material strongly supports the occurrence of texture. In magnesium alloys, during friction stir processing, the material flow along the tapered surface of the tool pin leads to the development of strong basal texture [19, 32, 34].…”

Section: Resultsmentioning

confidence: 99%

Machining characteristics, wear and corrosion behavior of AZ91 magnesium alloy ‐ fly ash composites produced by friction stir processing

Patle

Sunil²,

Dumpala

2021

Materialwissenschaft Werkst

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In the present work, fine grained AZ91 magnesium alloy – fly ash composite has been successfully fabricated by friction stir processing. Microhardness measurements show marginally higher hardness with uniform distribution compared with the base material. No significant difference in the mean cutting force was observed during drilling of the base metal and the composite. However, lower cutting forces were recorded in the sub‐surface region of the composites. Interestingly, decreased corrosion resistance was noticed for the composite compared with the base material. Lower mass loss has been observed for the composite during reciprocating wear experiments. The results strongly suggest that the surface composite of AZ91 magnesium alloy – fly ash exhibits better mechanical and wear properties. However, decreased corrosion resistance is a significant observation that warns the applicability of these composites in corroding environment.

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“…For achieving these composite materials, several techniques have been used [40]; the technique that is most utilized is powder metallurgy [66,67,68], followed closely by electrodeposition and electroless deposition (being nickel and copper the two metals which have been most used) [69,70,71,72,73,74,75,76]. An example of the kind of structures that can be obtained by using electrodeposition on carbon nanotube can be observed in Figure 7, where the author synthesized a CNT-Cu structure by this kind of electrochemical growth.…”

Section: Cnt As High Ampacity Materialsmentioning

confidence: 99%

High Ampacity Carbon Nanotube Materials

et al. 2019

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Constant evolution of technology is leading to the improvement of electronical devices. Smaller, lighter, faster, are but a few of the properties that have been constantly improved, but these developments come hand in hand with negative downsides. In the case of miniaturization, this shortcoming is found in the inherent property of conducting materials—the limit of current density they can withstand before failure. This property, known as ampacity, is close to reaching its limits at the current scales of use, and the performances of some conductors such as gold or copper suffer severely from it. The need to find alternative conductors with higher ampacity is, therefore, an urgent need, but at the same time, one which requires simultaneous search for decreased density if it is to succeed in an ever-growing electronical world. The uses of these carbon nanotube-based materials, from airplane lightning strike protection systems to the microchip industry, will be evaluated, failure mechanisms at maximum current densities explained, limitations and difficulties in ampacity measurements with different size ranges evaluated, and future lines of research suggested. This review will therefore provide an in-depth view of the rare properties that make carbon nanotubes and their hybrids unique.

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An investigation on the hardness and corrosion behavior of MWCNT/Mg composites and grain refined Mg

Cited by 55 publications

References 26 publications

Mechanical behavior and wear characteristics of fine grained ZE41 magnesium alloy

Mechanical behavior and wear characteristics of fine grained ZE41 magnesium alloy

Machining characteristics, wear and corrosion behavior of AZ91 magnesium alloy ‐ fly ash composites produced by friction stir processing

High Ampacity Carbon Nanotube Materials

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