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分級均勻化對7055鋁合金組織和力學(xué)性能的影響
發(fā)布人：上海艾荔艾金屬材料有限公司bt990.com.cn
更新時間：2015-10-17
采用差熱分析、X射線衍射分析、光學(xué)顯微鏡、掃描電鏡、透射電鏡和常溫拉伸等方法研究分級均勻化工藝對7055鋁合金顯微組織、枝晶偏析、Al3Zr粒子析出行為和力學(xué)性能的影響。
分級均勻化對7055鋁合金組織和力學(xué)性能的影響Effect of step-homogenization on microstructures and mechanical properties of 7055 aluminum alloy
采用差熱分析、X射線衍射分析、光學(xué)顯微鏡、掃描電鏡、透射電鏡和常溫拉伸等方法研究分級均勻化工藝對7055鋁合金顯微組織、枝晶偏析、Al3Zr粒子析出行為和力學(xué)性能的影響。結(jié)果表明：合金經(jīng)(468 ℃、24 h)+(473 ℃、4 h)的分級均勻化處理后，消除了鑄錠晶界上的非平衡凝固共晶組織；鑄錠先于264 ℃保溫最有利于獲得尺寸細(xì)小、均勻彌散分布的Al3Zr粒子；在單級均勻化基礎(chǔ)上增加473 ℃的短時高溫均勻化，能夠提高合金基體中溶質(zhì)原子的固溶度，增強(qiáng)時效強(qiáng)化效果，提高綜合性能。
The effects of step-homogenization on the microstructures, dendritic segregation, precipitation of Al3Zr particles and ultimate mechanical properties of aluminum alloy 7055 were studied by differential scanning calorimetry, X-ray diffractometry, optical microscopy, scanning electron microscopy, transmission electron microscopy and tensile test. The result show that the step-homogenization treatment, which comprises of the isothermal heating of the ingots at 468 ℃ for 24 h, then heating to 473 ℃ for 4 h, greatly eliminates the nonequilibrium solidified eutectic which exists on the grain boundaries. The previous heating at 264 ℃ is most favorable for the precipitation of fine and uniformly distributed Al3Zr particles. The additional short-term and high temperature heating at 473 ℃ on the basis of single-stage homogenization maximizes the solution ability of solid solute in the matrix, enhances the ageing strengthening effect and improves the comprehensive properties of the alloy.
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