Question

Magnalium is an alloy of:
A. Al + Mg
B. Al + Cu + Mg + Mn
C. Al + Zn + Mg + Ni
D. Al + Cu

Answer 1

Combinations with modest quantities of magnesium (about 5%) display more prominent strength, more noteworthy erosion opposition, and lower thickness than unadulterated aluminum. Such compounds are likewise more functional and simpler to weld than unadulterated aluminum.

Complete answer:
Even though they are commonly more costly than aluminum, the high strength, low thickness, and more prominent usefulness of amalgams with low measures of magnesium prompts their utilization in airplane and vehicle parts. Amalgams with about half magnesium are fragile and erode effectively, which makes them unsatisfactory for most designing employments.
Notwithstanding, these amalgams are combustible when powdered, are more impervious to consumption than unadulterated magnesium, and are more receptive than unadulterated aluminum, and are hence utilized in fireworks as a metal fuel and to create flashes.Because of the high reactivity, magnalium consumes similarly hot and frames brilliant yellowish-white sparkles.
Magnalium powder additionally ignites with a snapping sound whenever consumed without anyone else, and gives a decent trade-off between the reactivity of magnesium, and the dependability of aluminum. Another advantage of fireworks is the weakness of the amalgam, as referenced previously.
It is considerably more remarkable than aluminum powder, when thought about at comparable cross-section size and comparable safeguards should be taken according to magnesium. These incorporate risks of dampness and contradiction with different mixes (boric corrosive and ammonium mixes). It is additionally utilized for making balance radiates and different parts of light instruments.

Hence the correct answer is Option (A).

Note: It is substantially more remarkable than aluminum powder,when looked at comparative lattice size and comparative safeguards should be taken according to magnesium. These incorporate perils of dampness and incongruence with different mixes (boric corrosive and ammonium mixes).