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Investigation of Mechanical and Corrosion Properties of Al 7075/Garnet Metal Matrix Composites by Two-stage Stir Casting Process

M. Sambathkumar P. Navaneethakrishnan K.S.K. Sasikumar R. Gukendran K. Ponappa
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1123-1129 | DOI: 10.24425/amm.2021.136432
Keywords Al 7075 garnet Two-Stage Stir Casting Mechanical Properties corrosion properties
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Abstract

The impact of Garnet addition into the AL7075 Aluminium matrix on the physical, mechanical and corrosion properties are studied in this research paper. Al 7075/garnet composites are fabricated by using two-stage stir casting method in different (0, 5, 10, 15) volume percentages. Photomicrograph of prepared samples revealed the uniform distribution of garnet reinforcement into the base matrix. The corrosion rate is calculated by potentiodynamic polarization method. The actual density is increased by around 1.2% for Al 7075 / garnet (15%) composite as compared to base alloy. Micro hardness of Al 7075 / garnet (15%) composite is raised by around 47 (34%) compare to as cast base matrix. Al7075 / garnet (15%) composite tensile strength stood at 252 Mpa, which is 40% greater than the base alloy. Al 7075 / 15% garnet composites reduce around 97% of corrosion rate than the base matrix. Alloy elements influenced the corrosion than Garnet reinforcement.
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Authors and Affiliations

M. Sambathkumar
1
ORCID: ORCID
P. Navaneethakrishnan
1
ORCID: ORCID
K.S.K. Sasikumar
1
ORCID: ORCID
R. Gukendran
1
ORCID: ORCID
K. Ponappa
2
ORCID: ORCID
  1. Kongu Engineering College, Department of Mechanical Engineering, Erode, Tamilnadu, India
  2. Indian Institute of Information Technology Design and Manufacturing Jabalpur, Department of Mechanical Engineering, Jabalpur, India

Stability of Garnet-Type LI7LA3ZR2O12-Based Ceramics for All-Solid-State Batteries

Eun-Jeong Yi Keun-Young Yoon Hyun-Ah Jung Haejin Hwang
Archives of Metallurgy and Materials | 2019 | vol. 64 | No 2 | 579-583 | DOI: 10.24425/amm.2019.127581
Keywords All-solid-state batteries solid electrolytes garnet type ceramics ionic conductivity
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Abstract

Al and Nb-doped Li7La3Zr2O12 (LLZO) and W-doped LLZO lithium ion conducting electrolyte samples were prepared and their H2O stability was investigated. The LLZO samples were exposed to 50% humidified air for 48 h. After H2O exposure, a cubic to tetragonal transformation occurred and acquired SEM images exhibited the presence of reaction phases at the grain boundaries of Al and Nb-LLZO. As a result, the lithium ion conductivity significantly decreased after H2O exposure. On the contrary, W-LLZO showed good stability against H2O. Although the cubic to tetragonal transformation was also observed in H2O-exposed W-LLZO, the decrease in lithium ion conductivity was found to be modest. No morphological changes of the W-LLZO samples were confirmed in the H2O-exposed W-LLZO samples.

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Authors and Affiliations

Eun-Jeong Yi
Keun-Young Yoon
Hyun-Ah Jung
Haejin Hwang

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