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鎢絲增強(qiáng)銅基復(fù)合材料的動(dòng)態(tài)力學(xué)性能及斷裂特性
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Dynamic Mechanical Properties and Fracture Characteristics of Tungsten Fiber Reinforced Cu-Based Composites
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    摘要:

    通過滲流鑄造的方法制備出Wf/Cu82Al10Fe4Ni4復(fù)合材料，采用分離式霍普金森壓桿(SHPB)和掃描電鏡(SEM)研究其動(dòng)態(tài)壓縮行為及斷裂特性。結(jié)果表明：復(fù)合材料界面結(jié)合緊密，受沖擊時(shí)體現(xiàn)出良好的界面結(jié)合強(qiáng)度；在應(yīng)變率為2000 s-1下動(dòng)態(tài)壓縮材料發(fā)生部分塑性變形，局部表面出現(xiàn)裂紋；在應(yīng)變率為3000 s-1下動(dòng)態(tài)壓縮材料的動(dòng)態(tài)壓縮強(qiáng)度達(dá)到2500 MPa，材料內(nèi)部出現(xiàn)鎢絲劈裂、鎢絲彎曲斷裂以及基體合金斷裂3種破壞模式。同時(shí)，在材料的斷裂面上出現(xiàn)大量熔化帶，分析認(rèn)為熔化是隨著應(yīng)變率的提高而出現(xiàn)的，它改變了復(fù)合材料的斷裂方式，加速了Wf/Cu82Al10Fe4Ni4復(fù)合材料的整體失效

    Abstract:

    Tungsten fiber reinforced Cu82Al10Fe4Ni4 composites were prepared by a melt infiltrating casting method. Dynamic compression behavior and fracture characteristics were investigated by Split Hopkinson Pressure Bar (SHPB) and scanning electron microscopy (SEM). The results show that the interface between tungsten fibers and the matrix alloy is compact, and it exhibits high strength under dynamic compression. The composites create some plastic deformation and cracks under dynamic compression at strain rate of 2000 s-1. The dynamic compressive strength of the composites is 2500 MPa under dynamic compression at strain rate of 3000 s-1, and the failure modes of the composites include splitting and buckling of tungsten fiber and abruption of the matrix alloy. Meantime, the fracture surface creates lots of melting bands, which change the fracture mode of the composites and accelerate its failure

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吳 哲,武高輝,康鵬超,修子揚(yáng).鎢絲增強(qiáng)銅基復(fù)合材料的動(dòng)態(tài)力學(xué)性能及斷裂特性[J].稀有金屬材料與工程,2011,40(9):1580~1583.[Wu Zhe, Wu Gaohui, Kang Pengchao, Xiu Ziyang. Dynamic Mechanical Properties and Fracture Characteristics of Tungsten Fiber Reinforced Cu-Based Composites[J]. Rare Metal Materials and Engineering,2011,40(9):1580~1583.]
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  • 收稿日期:2010-09-20
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