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全層狀TiAl基合金斷裂機(jī)理原位觀察
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TG146.2 TG111.91

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國(guó)家自然科學(xué)基金資助項(xiàng)目(59895153)


In-Situ SEM Study of Fracture Mechanism in Fully Lamellar Ti-49at% Al Alloy
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    摘要:

    通過對(duì)裂紋與晶內(nèi)片層和晶界的交互作用的原位觀察，研究了全層狀組織TiAl基合金的斷裂機(jī)制。結(jié)果表明：裂紋萌發(fā)和擴(kuò)展方式不僅依賴于片層與拉伸軸的相對(duì)取向，還受晶界取向的制約。當(dāng)片層與拉伸軸成較大角度時(shí)，沿片層裂紋擴(kuò)展是通過主裂紋與沿片層微裂紋的連接及剪切的過程；而當(dāng)拉伸軸近乎平行片層時(shí)，跨片層裂紋依靠對(duì)界面分離和跨片層微裂紋這兩種形式的微裂紋的連接進(jìn)行擴(kuò)展的，縱向交叉晶界有利于斷裂韌性的提高，而橫向晶界則不利于材料斷裂韌性。

    Abstract:

    The fracture mechanism of fully lamellar Ti 49at% Al alloy has been investigated by studying the interactions between crack and lamellae or grain boundary. The results indicate that the nucleation and propagation mechanism of crack depend on not only lamellar orientation in grain but also the type of grain boundary. As the angle between tensile axis and lamellae is relatively large, main cracks propagate by nucleation, growth and linkage with interfacial microcracks. As the tensile axis is nearly parallel to the lamellae, translamellar cracks propagate by nucleation, growth and linkage with two types of microcracks, e g interface delamination and translamellar microcracks. Different types of grain boundary have different toughening effects on TiAl alloy, that is, interlock grain boundary nearly parallel to the tensile axis is beneficial to fracture toughness, and the grain boundary nearly perpendicular to the tensile axis is not beneficial.

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陸永浩 張永剛 等.全層狀TiAl基合金斷裂機(jī)理原位觀察[J].稀有金屬材料與工程,2001,(1):15~18.[Lu Yonghao, Zhang Yonggang, Qiao Lijie, Wang Yanbin, Chen Changqi, Chu Wuyang . In-Situ SEM Study of Fracture Mechanism in Fully Lamellar Ti-49at% Al Alloy[J]. Rare Metal Materials and Engineering,2001,(1):15~18.]
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  • 最后修改日期:2000-01-30
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