DYNAMIC DEFORMATION AND FRACTURE OF CHEMICAL VAPOR DEPOSlTIONED POLYCRYSTALLINE TUNGSTEN

【Author】

W.Guo~*,Beijing Institute of Technology,China H.C.Sun,Beijing Institute of Technology,China S.K.Li,Beijing Institute of Technology,China

【Abstract】

<正>The〈100〉textured polycrystalline tungsten has been prepared by chemical vapor deposition(CVD),and is compressed under both quasi-static and high strain rates(10~-3)—5×10~(-3) s~(-1)) loadings.Stress-strain curves show that CVDW is sensitive to strain rate,and at increasing strain rates,both the stress and strain are expected to increase.Work hardening and thermal softening are noticed during dynamic loading.The deformation and fracture behaviors are investigated:slip and twinning are the dominant competing mechanism of the plastic deformation,and intergranular and transgranular cracks features the failure of CVDW.The interaction of twins and cracks are thoroughly discussed in this paper,and the results well agree with the previous works.

【Keywords】

polycrystalline tungsten;;texture;;high strain rate;;twinning

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