展延性マグネシウム合金AZ31板の機械的性質に及ぼす<br>温間圧延条件の影響

Abstract

There is high demand for the use of magnesium alloys in automotive and electric parts, because that they have the lowest density among metals for practical use, and have excellent properties such as high specific strength, high vibration damping ratio and high electromagnetic interference shielding. However, there is a little application for magnesium alloys as metal-forming products because of their poor plastic deformability in the normal temperature range and their high production cost. To promote products manufactured by metal forming, rolling technologies enabling the production of thin sheets with suitable mechanical properties and surface qualities are required. For this purpose, hot-rolled AZ31 sheets are experimentally rolled with or without lubrication under temperatures ranging from 293K to 573K, and warm-rolled sheets are annealed for 1h at 523K. Grain structures are observed and their mechanical properties such as tensile strength, elongation and r value are investigated by tensile tests. Finally, the effect of warm-rolling conditions on their grain structures and mechanical properties are discussed for both as-rolled and annealed sheets.