Chapter 12, Problem 12.31P

Interpretation Introduction

Interpretation:

The precipitate particles number per cubic centimeter by referring to the given figure should be determined.

Concept introduction:

The formula used to determine the percentage of $\text{α}$ is:

  $\text{\% α = }\frac{\left[\text{Maximum}\text{weight}\text{\%}\text{Mg}\text{at tie}\text{line-Al}\text{weight}\text{\%}\text{Cu}\right]}{\left[\text{Maximum}\text{weight}\text{\%}\text{Cu}\text{at tie}\text{line-Minimum}\text{weight}\text{\%}\text{Cu}\text{at tie}\text{line}\right]}\text{×100}$