Abstract
Mechanical properties and macro or X ray structurs of Al-3-5%Mg 0-0.75%Mn 0-0.5%Cr alloys extruded by 1, 000 ton press to 4×40×40mm angle section were examined, relating to the extruding temperature and preheating of ingot. Results obtained are as follows:
1. Mn and Cr bring about the fibrous structure in the section.
2. Tensile properties of the sections are influenced to some degree by the amount of fibrous structure and grain size.
3. Mg, Mn and Cr increase strength, wheras Mn and Cr decrease elongation.
4. In some cases, the properties of the alloys are considerably influenced by the extruding temperature and preheating of ingot.
