Question

aluminium alloy is preferred than steel in automobile because it is more

Answer 1

Hi,
Aluminium is preferred over steel because it is lighter and even much stronger as compared to steel.
Aluminium is also present in abundance.
Hope this helps you......☺

Answer 2

Automobile Bodies: Can Aluminum Be an Economical Alternative to Steel?
Anish Kelkar, Richard Roth, and Joel Clark
TABLE OF CONTENTS
INTRODUCTION
BODY-IN-WHITE
METHODOLOGY
ANALYSIS OF SMALL CAR DESIGNS
ANALYSIS OF MIDSIZE CAR DESIGNS
ECONOMICS OF SUBSTITUTION
CONCLUSION
ACKNOWLEDGEMENTS
References
Although the use of aluminum in cars has been increasing for the past two decades, progress has been limited in developing aluminum auto bodies. In fact, most aluminum substitution has come in the form of castings and forgings in the transmission, wheels, etc. Car manufacturers have developed all-aluminum cars with two competing designs: conventional unibody and the spaceframe. However, aluminum is far from being a material of choice for auto bodies. The substitution of aluminum for steel is partly influenced by regulatory pressures to meet fuel efficiency standards by reducing vehicle weight, and to meet recycling standards. The key obstacles are the high cost of primary aluminum as compared to steel and added fabrication costs of aluminum panels. Both the aluminum and the automotive industries have attempted to make aluminum a cost-effective alternative to steel. This paper analyzes the cost of fabrication and assembly of four different aluminum car body designs,making comparisons with conventional steel designs at current aluminum prices and using current aluminum fabrication technology. It then attempts to determine if aluminum can be an alternative to steel at lower primary aluminum prices, and improved fabrication processes.

INTRODUCTION
The automobile and aluminum became commercially viable at about the same time in the late years of the 19th century; there are references to the use of the latter in the former from their very beginnings. Although steel is preferred by most automakers, in recent years changing fuel economy and recycling regulations have intensified weight-reduction attempts by automakers. Aluminum offers the ideal engineering solution: Its density is one-third that of steel and satisfies the torsion and stiffness requirements of an automotive material. However, aluminum by weight is about five times more expensive than steel.