EFFECT OF SiO2 AND Al2O3 ON MECHANICAL PROPERTIES OF ASTM A 494 M GRADE NICKEL ALLOY HYBRID METAL MATRIX COMPOSITES

In the present technological environment, the aerospace industry needs cutting-edge materials not only to meet the requirements such as lower weight and higher values of strength and stiffness, but also to protect against electromagnetic interference. In this article, an attempt has been made to prepare Al6061 hybrid metal matrix composites reinforced with varying percentages of SiC, Al2O3, and fly ash particulates through a stir-casting route. As per ASTM standards, various tests have been conducted to know the density, tensile strength, yield strength, and hardness. Simultaneously, all the prepared composites are tested for electromagnetic interference (EMI) shielding effectiveness (SE) under the X band frequency with the help of a vector network analyzer. In order to identify the composite possessing good mechanical properties, as well as shielding effectiveness, a TOPSIS methodology has been employed in this work. The present study reveals that the proposed hybrid composite contains 5% of each reinforcement material which shows better mechanical properties as well as good shielding effectiveness.

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Effect of Reinforcements on Mechanical Properties of Nickel Alloy Hybrid Metal Matrix Composites Processed by Sand Mold Technique

Applied Science and Engineering Progress ◽

10.14416/j.asep.2020.11.001 ◽

2020 ◽

Vol 14 (1) ◽

Author(s):

Kumaraswamy Jayappa ◽

Vijaya Kumar ◽

Gange Gowda Purushotham

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Hybrid Composites ◽

Research Work ◽

Weight Percent ◽

Matrix Composites ◽

Hybrid Metal Matrix Composites ◽

Ni Alloy

Hybrid Metal Matrix Composites (HMMCs) have gained wide applications in aerospace, marine, and domestic areas because of its significant properties relative to external forces and enabling environment. In present research work, Ni-alloy selected as a matrix and Al2O3 of 40–80 μm and TiO2 of 1–5 μm were selected as reinforcements. The composites were prepared by keeping 9 wt. % of TiO2 as unvarying and Al2O3 is varied from 3 weight % to 12 weight % in steps of 3 weight %. Induction furnace is used for the casting of composites and mixing is done by using mechanical stirring at 160 rpm for a time period of 5 min. The prepared composites are then tested for their tensile and hardness as per the ASTM standards. The Scanning Electron Microscopy was used for microstructural study. From experimentation, it was observed that increment in the weight percentage of Al2O3 with constant TiO2 increases the mechanical properties of hybrid composites and proper stirring improves homogeneity in the composite material. The test results show that the addition of Al2O3 up to 9 weight percent increases in tensile strength compared to Ni alloy and tensile strength slowly decreases with the addition of Al2O3 and that the hardness values are directly proportional to the weight percent of the addition of Al2O3 / TiO2.

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Study on Mechanical Properties of Al 7075 Hybrid Metal Matrix Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.813-814.230 ◽

2015 ◽

Vol 813-814 ◽

pp. 230-234 ◽

Cited By ~ 1

Author(s):

T.S.A. Suryakumari ◽

S. Ranganathan ◽

P. Shankar

Keyword(s):

Mechanical Properties ◽

Metal Matrix Composites ◽

Metal Matrix ◽

Stir Casting ◽

Impact Loads ◽

Matrix Composites ◽

Casting Method ◽

Weight Percentage ◽

Hybrid Metal Matrix Composites ◽

Al 7075

The present investigation involves studying the mechanical properties of the fabricated aluminium 7075 hybrid metal matrix composites reinforced with various weight % of SiC and Al2 O3 particulates by stir casting method. The Al 7075 hybrid metal matrix composites specimen were fabricated using L9 orthogonal array. The mechanical properties like Brinell Harness (BHN), Rockwell Hardness (HRC) and impact loads were experimented. The mechanical properties like hardness and impact loads have improved with the increase in weight percentage of SiC and Al2O3 particulates in the hybrid aluminium matrix.

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