if a material fails with little or no ductility is it said to be

In brittle failure, surface defects such as scratches or cracks are important factors that can increase the likelihood for fracture. 

As temperature increases, which of these tend to occur with metals?

Describe three defects that commonly occur in crystal lattices: 

Which of these materials is the stiffest? 

How does Rockwell hardness differ from Brinell hardness in terms of method and measurement used to determine hardness.

What are the three basic crystal structures in metals.

It is possible to cold work a metal at temperatures above the boiling point of water

Increasing temperature generally increases ductility and toughness.

Permanent (plastic) deformation occurs at the  _______