【摘要】 借助光学显微镜、透射电镜、X射线衍射及微拉伸试验等方法研究了深冷轧制工艺对H65黄铜板显微组织和抗拉强度的影响,分析了试样厚度引起的微尺寸效应对其力学性能的影响规律。结果表明:H65黄铜在深冷轧制不同变形量下均无新相产生;经过不同变形量的深冷轧制,H65黄铜板厚度从500μm减薄至70μm,显微组织逐渐细化并出现纤维组织,厚度为100μm时,组织内部出现了高密度位错和大量形变孪晶,孪晶与位错的交互作用显著;随着厚度的减小,强度上升,抗拉强度从原始态的474 MPa增加到734 MPa,表现出"越小越强"的尺寸效应。更多还原

【Abstract】 The effect of cryorolling process on microstructure and tensile strength of H65 brass was investigated by means of optical microscope,transmission electron microscopy,X-ray diffraction and micro tensile test,and the influence of micro size effect caused by specimen thickness on mechanical properties of the H65 brass was analyzed. The results show that no new phase is observed in the H65 brass during cryorolling process. After deep cryogenic rolling with different deformation,the thickness of the H65 brass sheet is reduced from 500 μm to 70 μm,and the microstructure is gradually refined and fiber texture appears. When the thickness of the H65 brass sheet is 100 μm,high density dislocation and a large amount of deformation twins are observed in the microstructure,and the interaction between them is significant. With the decreasing of thickness,the strength of the H65 brass sheet increases,and the tensile strength increases to 734 MPa from 474 MPa as received,showing the size effect of "smaller and stronger".更多还原