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对U-Nb合金施加不同程度的预应变后,利用自制的变形测量装置研究该合金在加热时的应变回复行为,结合透射电子显微镜(TEM)、X射线衍射(XRD)仪等对U-Nb合金的变形机制及形状记忆效应进行探讨。结果表明:高密度的孪晶组织在变形时的相互吞并、长大及择优取向是该合金在形变初期的主要变形机制,并认为U-Nb合金具有显著的形状记忆效应(SME),在加热过程中,其最大应变回复量可达3.2%,升温时粗大的孪晶组织通过逆相变重新取向和分解是导致该合金具有形状记忆效应的主要原因。
After the U-Nb alloy was pre-stressed to different extents, the strain recovery behavior of the alloy during heating was investigated by a self-made strain gauge. The microstructure of the U-Nb alloy was characterized by transmission electron microscopy (TEM) and X-ray diffraction Alloy deformation mechanism and shape memory effect are discussed. The results show that the high densification twinning phase debonding, growth and preferential orientation during deformation are the main deformation mechanisms of the alloy during the initial stage of deformation, and the U-Nb alloy has a significant shape memory effect (SME) During the process, the maximum strain recovery can reach 3.2%. The coarse twins at the time of temperature reorientation and decomposition by reverse phase transformation are the main causes of the shape memory effect of the alloy.