Al-4%Cu合金の析出に及ぼす引っかき加工の影響

抄録

Precipitate particles are occasionally adopted to study the deformed superficial layers. The aim of the present paper is to examine experimentally the structure, size and distribution of these particles formed at the deformed region by high voltage transmission electron microscopy. Specimens of Al-4% Cu alloy, solution treated at 540°C for 30 h and water quenched, are scratched with a diamond cone and aged at 260°C for 2 h. The main results obtained are as follows. (1) Isometric θ-phase precipitate particles at the heavily deformed superficial region are observed. (2) The size of plate-like θ'-phase precipitate particles at the plastically deformed region are smaller than that at the undeformed region, on the other hand, their density is larger than at the undeformed region. (3) Preferential precipitation on a particular habit plane of θ' depends on the crystal orientation of the scratching direction.