Teruo Takahashi1, Yasuhiko Hashimoto2, Shinichiro Omori2 and Koichiro Koyama2
1Metal Industrial Research Institute of Hyogo Prefecture, Miki. Present address: Industrial Research Institute of Hyogo Prefecture, Kobe
Dilute Cu-Al, Cu-Ti and Cu-Al-Ti alloys internally oxidized over the temperature range 1073--1323 K were investigated by X-ray diffractometry, optical and electron microscopy and microvickers hardness testing.
From X-ray diffractometry of the nitric-acid-treated residues, γ Al2O3, α Al2O3 and CuAlO2 in internally oxidized Cu-Al alloys and anatase and rutile type TiO2 in internally oxidized Cu-Ti alloys were identified, respectively. In internally oxidized Cu-Al-Ti alloys, all of the oxides observed in above both Cu-Al and Cu-Ti systems were identified, and other complex oxides were not detected.
By electron microscopy, it was revealed that the dispersion oxide particle size was remarkably decreased with addition of small amount of titanium into Cu-Al alloys. In accord with results from electron microscopy, the microvickers hardness increased with the ratio of TiO2 to whole oxide.
The internally oxidized Cu-Al-Ti alloys possessed excellent qualities that beloned to the internally oxidized Cu-Al and Cu-Ti alloys.
coppper-aluminum-titanium alloy, internal oxidation, dispersion hardening, dispersed oxides, X-ray analyses, microscopy
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