Titanium becomes significantly harder when a small amount of boron atoms is…
CHEMISTRY · Single correct · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties
Problem
Titanium becomes significantly harder when a small amount of boron atoms is incorporated into the lattice. Which of the following best explains this increase in hardness?
(a) Boron donates additional valence electrons, strengthening the metallic bonds between Ti atoms.
(b) Boron atoms occupy interstitial sites that impede dislocation motion within the Ti lattice.
(c) Alternating layers of boron and titanium form, preventing atomic planes from sliding past one another.
(d) Boron substitutes for some titanium atoms, creating lattice distortions that hinder dislocation movement.