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Design and Characterization of SMAT-MAO Composite Coating and Its Influence on the Fatigue Property of 2024 Al Alloy
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Design and Characterization of SMAT-MAO Composite Coating and Its Influence on the Fatigue Property of 2024 Al Alloy
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National Nature Science Foundation of China (51201008); the Fundamental Research Funds for the Central Universities (FRF-TP-12-166A); the General (2011M500241); Special Financial Grants from the China Postdoctoral Science Foundation (2012T50044)

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    摘要:

    在2024鋁合金表面制備納米化-微弧氧化復合涂層，該復合涂層由底層納米晶層及頂層陶瓷涂層構(gòu)成。采用XRD、TEM和SEM研究了復合涂層的微觀組織結(jié)構(gòu)，并研究了表面處理對鋁合金基體疲勞壽命的影響規(guī)律。頂層陶瓷涂層厚度分別為5和10 μm的復合涂層試樣的疲勞壽命分別提高了21.9%和23.2%，疲勞性能的改善是基體合金靠近涂層區(qū)域的納米晶結(jié)構(gòu)及殘余壓應力共同作用的結(jié)果；當頂層陶瓷涂層厚度增加到15 μm時，由于涂層表面較大的孔徑及涂層內(nèi)部存在的微裂紋，導致疲勞壽命降低

    Abstract:

    SMAT-MAO composite coating, consisting of a bottom nanocrystalline layer and a top ceramic coating, was designed and fabricated on the surface of 2024 Al alloy. The microstructure and the phase composition of SMAT-MAO coating were examined using X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The fatigue life of the treated alloy was evaluated. The results indicate that the SMAT-MAO coated samples with 5 and 10 μm thick ceramic coatings exhibit improved fatigue lifetime, increasing by 21.9% and 23.2%, respectively. The improved fatigue property is attributed to the combined effect of nanocrystalline structure and the residual compressive stress induced in the substrate near the ceramic coating. With ceramic coating thickness increasing to 15 μm, the fatigue lifetime of the SMAT-MAO coated sample is lightly reduced due to the protrudent degrading effect caused by the much bigger pores and pre-existing micro cracks on the coating surface

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文 磊,王亞明,金 瑩,孫冬柏. Design and Characterization of SMAT-MAO Composite Coating and Its Influence on the Fatigue Property of 2024 Al Alloy[J].稀有金屬材料與工程,2014,43(7):1582~1587.[Wen Lei, Wang Yaming, Jin Ying, Sun Dongbai. Design and Characterization of SMAT-MAO Composite Coating and Its Influence on the Fatigue Property of 2024 Al Alloy[J]. Rare Metal Materials and Engineering,2014,43(7):1582~1587.]
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  • 收稿日期:2013-06-08
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  • 在線發(fā)布日期: 2014-12-15
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