Question

Which $Mg$ alloy is used in making parts of jet engines?

• A. 3% Misch metal and 0.1% $Zr$
• B. 30% Misch metal and 1% $Zr$
• C. 30% Misch metal and 0.1% $Zr$
• D. 3% Misch metal and 1% $Zr$

Answer 1

Answer: (B)

30% Misch metal and 1% $Zr$

$Mg$ alloy that is used in making parts of jet engines is $30\%$ Misch metal and $1\%$ $Zr$.

Misch metal is an alloy of rare earth metals with iron and traces of S, C, Ca and Al. It improves the workability of steel.

Magnalium ($1$ to $15\%Mg+85$ to $99\%Al$) is used in the construction of aeroplanes, motors, balance beams and light instruments.

Hence, option $B$ is correct.