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高體積分?jǐn)?shù)TiB2/Al復(fù)合材料的動態(tài)壓縮性能
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Dynamic Compression Properties of TiB2/Al Composites
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    摘要:

    采用分離式霍普金森壓桿(SHPB)研究高體積分?jǐn)?shù)TiB2/Al復(fù)合材料(55%-65%)的動態(tài)壓縮性能，并對其在高應(yīng)變率下的損傷機(jī)制進(jìn)行分析。結(jié)果表明，相比應(yīng)變率不敏感的基體合金，高體積分?jǐn)?shù)TiB2/Al復(fù)合材料表現(xiàn)出明顯的應(yīng)變率敏感性；且隨著體積分?jǐn)?shù)的增加，其應(yīng)變率敏感系數(shù)和流動應(yīng)力值表現(xiàn)出先升后降趨勢。在高應(yīng)變率沖擊下，復(fù)合材料表現(xiàn)為脆性斷裂，增強(qiáng)相含量越高復(fù)合材料越易剪切破壞。復(fù)合材料斷面局部呈現(xiàn)熔融鋁團(tuán)，直徑為50~200 μm，這與絕熱溫升效應(yīng)有關(guān)。絕熱溫升使得基體合金軟化，有效緩解高體積分?jǐn)?shù)復(fù)合材料的瞬態(tài)失穩(wěn)破壞

    Abstract:

    Dynamic compression properties and adiabatic shear behavior of TiB2/Al composites (55%-65%, volume fraction) were investigated by split Hopkinson pressure bar (SHPB). The instantaneous failure of the composite was ascribed to the formation of adiabatic shear band when compressed. It is found that the composites tend to adiabatic shear failure as the reinforcement content increases. The flow stress and strain rate sensitivity exhibit rise/fall tendency with the increasing of strain rates. Additionally, the plastic deformation ability of the composites at high strain rates is highly improved. All the composites were failed in brittle fracture, which is controlled by the breaking of reinforcement particles and splitting of TiB2-Al interfaces

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武高輝,朱德智,陳國欽,姜龍濤.高體積分?jǐn)?shù)TiB2/Al復(fù)合材料的動態(tài)壓縮性能[J].稀有金屬材料與工程,2010,39(2):262~267.[Wu Gaohui, Zhu Dezhi, Chen Guoqin, Jiang Longtao. Dynamic Compression Properties of TiB2/Al Composites[J]. Rare Metal Materials and Engineering,2010,39(2):262~267.]
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  • 收稿日期:2009-02-20
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