Mechanical and Damping Properties of Squeeze Cast Hybrid Mg Matrix Composites

Abstract In this study, parent aluminum (Al), silicon carbide (SiC) reinforced Al, zirconia (ZrO2) coated SiC reinforced Al, and lithium zirconate spinel (Li2ZrO3, LZO) encapsulated SiC incorporated Al metal matrix composites were processed via friction stir processing (FSP) technique to observe the influence of grain refinement on mechanical and damping properties. Electron backscattered diffraction (EBSD) analysis were conducted for detailed and deep understanding of possible mechanism and microstructure at longitudinal cross sections of the samples. Further, the room temperature mechanical properties and thermal cyclic (−100 to 400 °C) damping performance of the friction stir processed composites were studied. The results obtained in this investigation show that storage modulus of pristine Al, SiC reinforced Al, ZrO2 coated SiC reinforced Al, and LZO coated SiC reinforced Al were improved by a factor of 1.09, 1.17, 1.09, and 1.38, respectively, after FSP. Additionally, the ultimate tensile strength (UTS) and hardness of the friction stir processed SiC/Li2ZrO3/Al composite were improved by a factor of 1.08 and 1.11, respectively, after FSP was compared with an unprocessed composite.

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Microstructure and Mechanical Properties of Reaction Squeeze Cast Hybrid Al Matrix Composites

Journal of Composite Materials ◽

10.1177/002199801772661623 ◽

2001 ◽

Vol 35 (17) ◽

pp. 1570-1586

Author(s):

Changwook Son ◽

Ikwoo Kim ◽

Ikmin Park ◽

Kyung-Mox Cho ◽

Ildong Choi

Keyword(s):

Mechanical Properties ◽

Matrix Composites ◽

Squeeze Cast ◽

Microstructure And Mechanical Properties ◽

Al Matrix Composites ◽

Al Matrix

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Mechanical Characterization and Machining of Squeeze Cast AZ91D/SiC Magnesium based Metal Matrix Composites

Procedia Manufacturing ◽

10.1016/j.promfg.2018.02.014 ◽

2018 ◽

Vol 20 ◽

pp. 97-105 ◽

Cited By ~ 10

Author(s):

I. Balasubramanian ◽

R. Maheswaran ◽

V. Manikandan ◽

Nilesh Patil ◽

M. Ayyanar Raja ◽

...

Keyword(s):

Metal Matrix Composites ◽

Metal Matrix ◽

Mechanical Characterization ◽

Matrix Composites ◽

Squeeze Cast

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Elucidation on the Microstructural and Mechanical Properties of Tailored VAL12 Hybrid Composites with ZrO2 Dispersoids Fabricated by Squeeze Casting Technique

Materials Science Forum ◽

10.4028/www.scientific.net/msf.969.813 ◽

2019 ◽

Vol 969 ◽

pp. 813-818 ◽

Cited By ~ 1

Author(s):

S.A. Srinivasan ◽

S.P. Kumaresh Babu ◽

Vivek Gaurav

Keyword(s):

Mechanical Properties ◽

Hybrid Composites ◽

Advanced Characterization ◽

Lower Percentage ◽

Matrix Composites ◽

Nucleation Kinetics ◽

Casting Technique ◽

Squeeze Cast ◽

Porosity Defects ◽

Lubricating Property

The effect of ZrO2(2, 4, 6 and 8 wt%) dispersoids with 1 wt% graphite on the microstructural, mechanical properties on squeeze cast VAL12 matrix hybrid composite is investigated in the present study. The hybrid composites were characterized using advanced characterization techniques to reveal its microstructural and physical properties. The microscopic examinations using optical and SEM technique reveal that the addition of dispersoids accelerates the nucleation kinetics, thus attaining fine, equiaxial grains in hybrid composites. The squeeze cast composites show almost nil porosity, defects and owing to it, the actual density of the composites are found to be more than 95% as that of the theoretical density values. The hardness values and tensile values increase with respect to the increase in percentage addition of ZrO2. The tensile results show that there is an appreciable increase in the UTS values of composites without much loss in its ductility as the addition of graphite improves the self-lubricating property and provides wettability during the casting. Fractographic studies on tensile tested specimen reveal that the crack occurs in both matrix and particles showing the good interface between matrix and dispersoids. Machinability studies reveal the formation of continuous chips in hybrid composites with a lower percentage of reinforcement (up to 4% ZrO2+ 1%Gr) and segmented chips in case of the composite with 8% ZrO2+ 1%Gr, as the increase in the percentage of dispersoids improve the chip breakability of the composites. On an overall, the hybrid aluminium matrix composites with 1%Gr and 6 % ZrO2unveiled better optimal results.

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