Furukawa-Sky Review No.5 (April 2009)
技術論文
Mgを含む熱交換器用Al-Mn系合金のろう付加熱後の時効挙動
Aging Phenomena after Brazing of Mg-Containing Al Alloys for Heat Exchangers
922KB）- 安藤 誠
Makoto Ando - 鈴木 義和
Yoshikazu Suzuki - 新倉 昭男
Akio Niikura - 戸次 洋一郎
Yoichiro Bekki
少量のMgを含む熱交換器用Al-Mn 系合金のろう付加熱後の時効挙動を検討した。MgおよびCu添加量の異なるAl-Mn系合金をろう付処理に相当する600℃の加熱の後，200℃/minの冷却に供し，室温および90℃にて保持した。その結果，Al-0.5Si-0.2Fe-0.15Cu-1.1Mn-0.3Mg合金は90℃で90日間保持すると時効硬化によって耐力がろう付加熱後の3倍にまで増加し，MgまたはCu の添加量を0.5%に増加させると時効硬化はさらに増大することが明らかになった。TEMおよびDSCを用いた分析により，時効硬化はMg-Siまたは Al-Mg-Si-Cuクラスタが生成することによるものと推定された。
Aging behavior of Al-Mn based alloys containing small amount of Mg was investigated. Al-Mn based alloys containing different amounts of Mg and Cu were heated to 600℃ followed by cooling at the rate of 200℃/min, which simulated the heating pattern of brazing. After this, they were kept at room temperature and 90℃ for 1 to 90days. As a result, it was revealed that the strength of the Al-0.5Si-0.2Fe-0.15Cu-1.1Mn-0.3Mg (mass %) alloy increased with time. The alloy aged for 90 days showed about three times higher yield strength than the alloy aged for 1day. This means that age hardening at 90℃ after brazing is highly effective in strengthening the heat exchanger materials containing Mg. The other alloys which contain higher amounts of Mg or Cu showed larger age hardening. By means of TEM and DSC analysis, it was estimated that the aging precipitates were clusters of Mg-Si or Al-Mg-Si-Cu.
技術論文 / Technology Articles
- プレコート材の放熱特性に及ぼす塗膜中の樹脂種およびグラファイトの影響
Effects of Resin Type and Graphite in Coating Films on the Heat Radiating Properties of Pre-Coated Aluminum Sheets - Mgを含む熱交換器用Al-Mn系合金のろう付加熱後の時効挙動
Aging Phenomena after Brazing of Mg-Containing Al Alloys for Heat Exchangers - 湿度制御雰囲気中におけるアルミニウム合金の低ひずみ速度引張り変形特性
Slow Strain Rate Tensile Properties of Aluminum Alloys under Controlled Experimental Humidity