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Why is NI-Ti alloy used in making eye frames?

(a) Because they are hard

(b) Because they are not flexible

(c) Because they are hard to break

(d) Because they are SMA

This question was addressed to me in semester exam.

My doubt is from Metallic Glasses in section Advanced Engineering Materials of Engineering Physics II

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The correct choice is (d) Because they are SMA

Explanation: NI-Ti alloys are shape memory alloys. Recently manufactured eye glass frames can be bent back and forth and can retain its original shape within a fraction of time. All these materials are made up of NI-Ti alloys, which can withstand maximum deformation.

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