AZ31B magnesium alloy and nano-composite were manufactured by hybrid casting process and hot extruded at 350°C. The sliding wear behaviour of alloy and nano-composite was estimated at room temperature using the standard pin-on-disc wear test equipment. The tests were conducted under a normal load of 10 N at different sliding speeds ranging from 0.60 to 1.2 m/s for distance up to 2000 m. The wear mechanisms of the worn out surface were studied using SEM analysis. The influence of test parameters on wear rate of the pins was established using a linear regression model statistically. Compared with the AZ31B magnesium alloy, the nano-composite shows lower wear rates due to higher hardness improvement caused by the reinforcement. The wear mechanism appears to be a mix-up of ploughing, rows of furrows, delamination and oxidation. © 2012 The Nonferrous Metals Society of China.

M. Kamaraj

Department of Metallurgical and Materials Engineering

AZ31B MAGNESIUM ALLOYS

CASTING PROCESS

LINEAR REGRESSION MODELS

NORMAL LOADS

PIN ON DISC WEAR TEST

Room temperature

SEM ANALYSIS

SLIDING SPEED

SLIDING WEAR BEHAVIOUR

TEST PARAMETERS

Wear mechanism

Wear mechanisms

Wear rates

Alloys

Linear Regression

Magnesium

Magnesium alloys

MAGNESIUM CASTINGS

Nanocomposites

Testing

tribology

Wear of materials

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Sliding wear behaviour of AZ31B magnesium alloy and nano-composite

Transactions of Nonferrous Metals Society of China (English Edition)

The disposal of used automobiles tyres is a major environmental concern of the day. Annually, there are 1.2 billion tyres seeking disposal issues globally. Concrete as a major construction material can potentially adopt processed rubber waste—derived from tyres as a partial replacement for aggregates. The present study is focused on mechanical and thermal properties of concretes with rubber as partial replacement to well-graded conventional aggregates. The study includes replacement of 10, 20, 30 and 100% of coarse aggregate with waste tyre aggregates and was compared with conventional M30 grade concrete. Concretes were subjected a thermal cyclic heating of 50 °C for a period of 7 days. The results showed that the weight of the rubber concrete is reduced by 12% compared to the conventional concrete and the strength of the concrete reduces with the increase in rubber content. At ambient temperatures, the rubber concrete was found thermally stable. The compressive strengths were found increasing after cyclic heating of 50 °C for a period of 7 days. This effect may be due the effect of Portland pozzolana cement which has 30% of fly ash in it. From this study, it can be concluded that rubber waste concretes can be a potential candidate for structural and non-load bearing structures at ambient temperatures. © 2019, Springer Nature Singapore Pte Ltd.

Lecture Notes in Mechanical Engineering

On Mechanical and Thermal Properties of Concretes with Rubber as Partial Replacement to Well-Graded Conventional Aggregates

The main objective of the present work is to investigate the dry sliding wear behaviour of a magnesium matrix composite reinforced with zinc oxide nano-particles. Magnesium matrix composites have many applications, especially in the automotive and aerospace industries, due to their superior specific properties. A magnesium matrix composite with 0.5. vol.% ZnO nano-reinforcement was prepared using powder metallurgy and was hot extruded to eliminate pores. The wear behaviour of the Mg/ZnO nano-composite was investigated by conducting dry sliding tests as a function of wear with an oil-hardened non-shrinking (OHNS) steel disc as the counterpart on a pin-on-disc apparatus. Wear tests were conducted for normal loads of 5, 7.5 and 10. N at sliding velocities of 0.6, 0.9 and 1.2. m/s at room temperature. The variations of the friction coefficient and wear rate with the sliding distances (500. m, 1000. m and 1600. m) for different normal loads and sliding velocities were plotted and analysed. To study the dominant sliding wear mechanism for various test conditions, the worn surfaces were analysed using scanning electron microscopy. The wear rate was found to increase with the load and sliding velocity. © 2014 Elsevier Ltd.

Materials and Design

Dry sliding wear behaviour of zinc oxide reinforced magnesium matrix nano-composites

Wear

Tribological behavior of pure Mg and AZ31 magnesium alloy strengthened by Al2O3 nano-particles

Journal of Composite Materials

Microstructure and Mechanical Characteristics of AZ31B/Al2O3 Nanocomposite with Addition of Ca

Nanotechnology

Development of novel carbon nanotube reinforced magnesium nanocomposites using the powder metallurgy technique

Metallurgical and Materials Transactions A

Enhancing physical and mechanical properties of Mg using nanosized Al2O3 particulates as reinforcement

Wear of magnesium composites reinforced with nano-sized alumina particulates

Journal	Transactions of Nonferrous Metals Society of China (English Edition)
ISSN	10036326
Open Access	No