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新型γ-TiAl合金的γ/α2層片形成機理
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國家自然科學基金項目(51001088)


Formation Mechanism of γ/α2 Full Lamellar in the New γ-TiAl Alloy
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    摘要:

    討論了經(jīng)過不同冷卻速率、加熱溫度和保溫時間對新型TiAl合金的γ/α2層片組織的影響。結(jié)果表明:熱處理時間增加,層片晶團的晶粒有長大趨勢,片層組織中出現(xiàn)層錯,位錯等缺陷;在不同冷卻方式中,油冷組織中出現(xiàn)了塊狀γ,爐冷組織具有密集的層片。熱處理溫度在Tα相變點以上20 ℃內(nèi),片層晶團的晶粒最小,這是由合金中的弱β穩(wěn)定元素Ta造成的。

    Abstract:

    Microstructural characteristics of TiAl-3Ta-x(Cr,W) alloy have been investigated in various annealing conditions, including cooling rates, heating temperatures and holding time by optics microscope (OM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the α2+γ grains grow with longer heat treatment time while the fault and the dislocation are found in the full lamellar microstructure. The massive γ precipitate in the microstructure by oil quenching and the full lamellar microstructure occurs by furnace cooling. Besides, the grain size of full lamellar is the smallest in the microstructure at the heat treatment temperature from Tα to Tα+20 oC, which is caused by weak β stable element Ta.

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羅媛媛,奚正平,毛小南,楊 義,曾衛(wèi)東.新型γ-TiAl合金的γ/α2層片形成機理[J].稀有金屬材料與工程,2014,43(4):896~900.[Luo Yuanyuan, Xi Zhengping, Mao Xiaonan, Yang Yi, Zeng Weidong. Formation Mechanism of γ/α2 Full Lamellar in the New γ-TiAl Alloy[J]. Rare Metal Materials and Engineering,2014,43(4):896~900.]
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  • 收稿日期:2013-04-19
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  • 在線發(fā)布日期: 2014-07-30
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