冷变形对GH3535合金的组织和力学行为的影响

发布时间：2018-11-27 09:21

【摘要】：对GH3535合金进行不同变形量的拉伸,研究了冷变形对GH3535合金力学性能的影响,用OM、TEM对冷变形后的组织结构进行观察并结合真应力-真应变曲线分析了GH3535合金加工硬化的变形机制。结果表明,GH3535合金具有显著的加工硬化特性,冷变形使其强度和硬度提高,但是塑性降低;随着变形量的增大晶粒沿着变形方向伸长,孪晶变多且更粗大。GH3535合金的加工硬化规律遵循Ludwigson模型,随着冷变形量的增大GH3535合金的加工硬化指数降低,变形机制由单滑移和孪生逐渐变成交滑移和孪生。当变形量小于30%时加工硬化主要是位错的长程应力场和孪晶引起的,当变形量大于30%时主要是位错的短程应力场和形变孪晶引起的。
[Abstract]:The effect of cold deformation on the mechanical properties of GH3535 alloy was studied by drawing with different amount of deformation. The effect of cold deformation on the mechanical properties of GH3535 alloy was studied. The microstructure of GH3535 alloy after cold deformation was observed by TEM and the deformation mechanism of GH3535 alloy was analyzed by combining true stress-strain curve. The results show that GH3535 alloy has obvious work-hardening property, cold deformation increases its strength and hardness, but the plasticity decreases. With the increase of deformation amount, the twinning becomes more and more coarse. The work hardening law of GH3535 alloy follows the Ludwigson model, and the work hardening index of GH3535 alloy decreases with the increase of cold deformation. The deformation mechanism changes from single slip and twinning to intersecting slip and twinning. When the deformation is less than 30%, the work hardening is mainly caused by the long range stress field and twins of the dislocation, and when the deformation is greater than 30%, it is mainly caused by the short range stress field of the dislocation and the deformation twin.
【作者单位】：东华大学机械工程学院;中国科学院上海应用物理研究所;中国科学院核辐射与核能技术重点实验室;
【基金】：ANSTO-SINAP联合材料研究项目2014DFG60230 国家自然科学基金51371188和51371189 中国科学院战略性先导科技专项项目XD02004210资助~~
【分类号】：TG132.3

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