Al-Zn-Mg-Cu-La系押出合金の引張強度特性と耐応力腐食割れ性に及ぼすCr, MnおよびMg添加の影響

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タイトル別名
  • The Effect of Cr, Mn and Mg Content on the Tensile Properties and SCC Resistance of Extruded Al-Zn-Mg-Cu-La System Alloys.
  • Ａｌ‐Ｚｎ‐Ｍｇ‐Ｃｕ‐Ｌａ系押出合金の引張強度特性と耐応力腐食割れ性に及ぼすＣｒ，ＭｎおよびＭｇ添加の影響
  • Al Zn Mg Cu Laケイ オシダシ ゴウキン ノ ヒッパリ キョウド

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Two groups of the extruded high strength Al-Zn-Mg-Cu-La system alloys, including Al-10 wt.%Zn-1 wt.%Mg-1.5 wt.%Cu-3 wt.%La with various Cr and Mn contents and Al-8 wt.%Zn-1.2 wt.%Cu-4.0 wt.%La with various Mg contents, were developed as the mechanical materials with a good stress corrosion cracking (SCC) resistance. In these alloys, the effects of the additional elements were investigated on the mechanical properties and SCC life. The main results are as follows;<br>(1) The second phase particles which contained Zn and La were observed in the matrix, and dispersed homogeneously. The size of the particles was 5 to 10μm. For the alloys with Cr, dispersoids including Cr were also observed in the matrix. Their size was over 10μm.<br>(2) The maximum value of 568MPa in tensile strength was observed in Al-8 wt.%Zn-1.2 wt.%Cu-4.0 wt.%La with 2.5 wt.%Mg, which was nearly equal to the commercial aluminum alloys7075-T73 and 7475-T6.<br>(3) The excellent resistance of SCC was obtained in these alloys. Their SCC lives were over 15 times as long as that of Al-8 wt.%Zn-1 wt.%Mg master alloy. In conclusion, we developed extruded Al-high Zn-low Mg system alloys with high strength and good SCC resistance.

収録刊行物

  • 材料

    材料 43 (485), 210-216, 1994

    公益社団法人 日本材料学会

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