Difficulty: Easy
Correct Answer: magnalium
Explanation:
Introduction / Context:Nomenclature of aluminium alloys in shop-floor and exam problems often uses trade names that hint at the main alloying elements and intended properties. Being able to map approximate compositions to these conventional names is a basic but important metallurgical skill for materials selection and heat-treatment planning.Given Data / Assumptions:
Concept / Approach:Magnalium is the long-established name for aluminium–magnesium alloys, typically with magnesium content anywhere from a few percent up to double digits, sometimes with minor copper, silicon, or nickel to tune strength and castability. Duralumin denotes aluminium–copper wrought alloys around 4% Cu with small Mg and Mn, optimized for age hardening. Y-alloy is an aluminium–copper–nickel–magnesium casting alloy for elevated temperature. Hindalium is a regional trade name for Al–Mg–Mn sheet alloys but not the classic Al–Mg with a defined copper addition near 1.75%.
Step-by-Step Solution:
Match the dominant solute (2–10% Mg) to the trade family best known for Al–Mg systems → magnalium.Check the small Cu addition (about 1.75%) — permissible in some magnalium grades; not typical of duralumin where Cu is the major addition (~4%).Exclude Y-alloy (needs Ni ~2%) and alclad (a cladding process, not a composition), and hindalium in its common sense.Verification / Alternative check:Property sets for magnalium emphasize low density and improved strength over pure aluminium plus good machinability; these align with Al–Mg systems containing minor Cu.
Why Other Options Are Wrong:
Common Pitfalls:Assuming any Cu presence implies duralumin; conflating processing terms (alclad) with alloy names.
Final Answer:
magnalium
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