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Yb微合金化對Al-Zn-Mg-Cu-Zr合金再結(jié)晶行為和性能的影響
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國家基礎(chǔ)研究規(guī)劃資助項目（2005CB623704）；國家自然科學(xué)基金（50471057）；國防重點實驗室、國家自然科學(xué)基金委員會創(chuàng)新研究群體科學(xué)基金（50721003）


Effect of Yb Additions on Recrystallization Behavior and Properties of Al-Zn-Mg-Cu-Zr Alloys
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    摘要:

    采用鑄錠冶金法制備了含Yb的Al-Zn-Mg-Cu-Zr合金。通過對硬度、電阻率、強度、應(yīng)力腐蝕性能的測試和用金相顯微鏡和透射電鏡的觀察，分析了Yb微合金化對Al-Zn-Mg-Cu-Zr合金再結(jié)晶行為和性能的影響。結(jié)果表明，在Al-Zn-Mg-Cu-Zr合金中添加微量Yb能形成含Yb的細小彌散相，因此提高T6態(tài)合金的再結(jié)晶溫度，顯著提高合金的應(yīng)力腐蝕抗力和斷裂韌性，并略微提高合金的強度和塑性。這些均勻分布于基體上的彌散相能強烈釘扎位錯和亞晶界，抑制了再結(jié)晶形核，顯著抑制了基體再結(jié)晶，保持形變回復(fù)組織。

    Abstract:

    Al-Zn-Mg-Cu-Zr alloys containing Yb were prepared by cast metallurgy. Effects of 0.30 wt% Yb additions on the recrystallization behavior and the performances of Al-Zn-Mg-Cu-Zr alloys were investigated by hardness and electric resistance measurement, tensile test, stress corrosion cracking test measurement, optical microscopy and transmission electron microscopy. The results show that the ytterbium additions to Al-Zn-Mg-Cu-Zr aluminum alloys will increase the recrystallization temperature, obviously enhance the resistance to stress corrosion cracking and the fracture toughness property, and slightly increase the strengths and ductility at T6 treatment. It is attributed to the dispersoids with Yb containing. Those dispersoids homogeneously distributed in the Al matrix strongly pin dislocation and subgrain boundaries, which can significantly retard the recrystallization by inhibiting the nucleation of recrystallization.

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陳康華,方華嬋,張 茁,齊雄偉. Yb微合金化對Al-Zn-Mg-Cu-Zr合金再結(jié)晶行為和性能的影響[J].稀有金屬材料與工程,2009,38(4):607~611.[Chen Kanghua, Fang Huachan, Zhang Zhuo, Qi Xiongwei. Effect of Yb Additions on Recrystallization Behavior and Properties of Al-Zn-Mg-Cu-Zr Alloys[J]. Rare Metal Materials and Engineering,2009,38(4):607~611.]
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  • 收稿日期:2008-03-30
  • 最后修改日期:2009-02-13
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