◆. Hardening Curve 1. Characteristic of hardening curve Strain Hardening curve of single crystal -T-y curve It can be divided in to three stages 1. for I: Easy-glide 2. for II: Linear hardening dd is very great 3. for I: Parabolic hardening LI d flow stress△r=-rStrain Hardening curve of single crystal —— curve. It can be divided in to three stages: 1. for Ⅰ: Easy-glide 2. for Ⅱ: Linear hardening is very great 3. for Ⅲ: Parabolic hardening ↓ flow stress  − dr d dr d   = − I Ⅱ Ⅲ ◆Ⅱ.Hardening Curve 1. Characteristic of hardening curve