Effect of Variations in Microwave Processing Temperatures on Microstructural and Mechanical Properties of AA7075/SiC/Graphite Hybrid Composite Fabricated by Powder Metallurgy Techniques

Manohar, Guttikonda; Pandey, Krishna Murari; Maity, Saikat Ranjan

doi:10.1007/s12633-021-01554-x

Cited by 16 publications

(6 citation statements)

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“…38 To eradicate this agglomeration formation and to improve mechanical properties researchers generally employed the microwave sintering technique to synthesize HMMC. 21 As ceramic reinforcements are excellent microwave absorbers, adding hard ceramic particles such as SiC or Snail shell powder with large microwave penetration depths and low loss tangent values helps achieve higher mechanical properties with fewer flaws. 19,22 The U.T.S and compression strength values for the microwave-sintered A6Si6SS HMMC at different sintering temperatures was shown in Figure 13.…”

Section: Resultsmentioning

confidence: 99%

“…The green compacts were subjected to conventional sintering at 600°C for 2 h and MAS at 400 °C, 450 °C, 500 °C and 550 °C for 30 min at a 10°C/min heating rate. 21 Composites were preheated using a SiC susceptor until they reached critical temperatures for internal heat generation during the absorption of the microwaves. 22,23 Initially, the Al- x% SiC ( x = 2 wt%, 4 wt%, 6 wt%, 8 wt%, 10 wt%) composites were made through powder metallurgy technique.…”

Section: Materials and Fabrication Methodsmentioning

confidence: 99%

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Influence of microwave sintering temperatures on mechanical and microstructural Behavior of Al/SiC/snail shell hybrid composite synthesized through powder metallurgy technique

Venkatesh¹,

Rao

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study emphasizes the synthesis of hybrid aluminum composite reinforced with SiC and Snail Shell (S-Shell) particles through the powder metallurgy technique. The hybrid composite corresponding to the optimized volume fraction of SiC and Snail shell powder (Al-6%SiC-6%S-Shell) was subjected to microwave-assisted sintering (MAS) by varying the sintering temperatures from 400°C to 550°C in steps of 50°C. Results concluded that microwave-sintered composites show superior mechanical characteristics than the composites sintered through conventional sintering techniques. The maximum ultimate tensile strength (U.T.S) of 316 MPa, and compression strength of 396 MPa were obtained for microwave sintered Al-6%SiC-6%Snail shell powder composite sintered at 500°C. However, increasing the sintering temperature above 500°C leads to a reduction in U.T.S and Compression strength due to the formation of coarse grains by absorbing the microwaves at higher temperatures. The U.T.S, Compression strength and Vickers hardness of the microwave sintered Al-6%SiC-6%Snail shell powder hybrid composite sintered at 500°C was enhanced by 42.08%, 42.4%, and 35.5% compared to conventionally sintered hybrid composite. The grain size was found to be increased with an increase in microwave sintering temperature due to the enhancement in the absorption capability of the microwaves with the temperature rise. The results of this study also suggest that choosing materials with a high microwave response helps to achieve improved mechanical properties for microwave-sintered composites.

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Section: Resultsmentioning

confidence: 99%

Section: Materials and Fabrication Methodsmentioning

confidence: 99%

Influence of microwave sintering temperatures on mechanical and microstructural Behavior of Al/SiC/snail shell hybrid composite synthesized through powder metallurgy technique

Venkatesh¹,

Rao

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…the dielectric properties of the as-received aluminium and kaolin powders were measured by using the network analyzer operating at a frequency of 0.5-3 Ghz integrated with a dielectric kit probe [19]. tensile and compression tests were performed as per aStm e8 and aStm e9 standards on the m30 model micro universal testing machine [20]. the eConomet Vh1md micro Vickers hardness tester was utilised to assess the hardness of the composite as per aStm e384-16 specifications with the application of a 500 g load [21].…”

Section: Composite Characterization Methodsmentioning

confidence: 99%

Archives of Metallurgy and Materials

2022

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the present research addresses the low-temperature sintering of 4% kaolin clay reinforced aluminium composite using susceptor-aided microwave sintering at 2.45 Ghz frequency. kaoline clay the naturally available mineral in the north-eastern regions of india. the study aims to convert this kaoline clay into the value added product with enhanced mechanical properties. the al-x% kaolin (x = 2, 4, 6, 8, 10) composite was fabricated through the powder metallurgy process by the application of 600 mPa compaction pressure. the composite corresponding to optimum ultimate tensile strength (u.t.S) was subjected to single-mode cavity microwave-assisted sintering by varying the sintering temperatures as 500°C, 550°C and 600°C. the effect of incorporating kaolin clay on the dielectric characteristics of composite powders, as well as the effect of sintering temperature on the microstructural changes and mechanical characteristics of al-4%kaolin composites were also examined. results concluded that the addition of 4 wt% kaolin powder improves the dielectric characteristics of the composite powder. the maximum hardness. Compression strength and u.t.S of 97 hv, 202 mPa and 152 mPa respectively achieved for the al-4% kaolin composite sintered at 550°C. the higher fracture toughness of 9.56 ma. m 1/2 reveals the ductile fracture for the composite sintered at 550°C.

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“…Strong interface bonds are responsible for effective load transfer mechanisms from matrix to reinforcements. According to some studies on Al-B 4 C interface chemistry, effective load transfer mechanisms have been observed in the case of partially reacted interfaces [37,38]. From the studies of chemical reactivity between Al-B 4 C systems, it is concluded that partial chemical reactions at interface regions lead to the formation of an interface that is more than a physical bond and less than a fully reacted interface region [17].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Investigation on Microstructural and Mechanical properties of AA7075/SiC/ZrO 2 Hybrid composite fabricated by Powder Metallurgy Techniques

Manohar

2022

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Due to their superior qualities as compared to their parent alloys, composites are in high demand in the current industrial sectors. In the current study, research was conducted on the hybrid AA7075/SiC/ZrO2 composite that was developed using powder metallurgy techniques. SiC reinforcements were added, and mechanical characteristics began to improve to their best possible state. After optimum levels, properties degradation then started. According to the microstructural observations, agglomerations were the main cause of the decline in mechanical characteristics. The addition of ZrO2 particles to the optimized volume fractionated AA7075/SiC composite further improved the properties of the material. After the 3% ZrO2 level, properties began to deteriorate. Microstructural observations revealed that agglomerates are the main reason for the degradation of mechanical properties. While trying to disperse the agglomerated SiC and ZrO2 particles through higher ball milling periods, compressive lattice strains in the 7% SiC and non-uniform lattice strains in the 8% SiC composites were observed. Due to the differences in hardness of SiC and ZrO2 particles, long period ball milling of AA7075/8%SiC/4%ZrO2 hybrid composite powders showed damaged ZrO2 particles. XRD analysis revealed Al4C3 and Al3Zr intermetallic compounds in the S7 and S7Z4 composites, these cause the composite materials' mechanical characteristics to deteriorate. From the present investigation, it was observed that addition of SiC to the AA7075 contributes more while enhancing the properties of the composite compared to ZrO2. Overall in the current study, a total enhancement of 195% in compression was noticed when compared to base alloy.

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Effect of Variations in Microwave Processing Temperatures on Microstructural and Mechanical Properties of AA7075/SiC/Graphite Hybrid Composite Fabricated by Powder Metallurgy Techniques

Cited by 16 publications

References 52 publications

Influence of microwave sintering temperatures on mechanical and microstructural Behavior of Al/SiC/snail shell hybrid composite synthesized through powder metallurgy technique

Influence of microwave sintering temperatures on mechanical and microstructural Behavior of Al/SiC/snail shell hybrid composite synthesized through powder metallurgy technique

Archives of Metallurgy and Materials

Investigation on Microstructural and Mechanical properties of AA7075/SiC/ZrO 2 Hybrid composite fabricated by Powder Metallurgy Techniques

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