The deformation behaviors of W nanowires embedded in a TiNi matrix were investigated by means of in-situ synchrotron high energy X-ray diffraction(HEXRD) and in-situ transmission electron microscopy(TEM) analysis duri...The deformation behaviors of W nanowires embedded in a TiNi matrix were investigated by means of in-situ synchrotron high energy X-ray diffraction(HEXRD) and in-situ transmission electron microscopy(TEM) analysis during tensile deformation.The HEXRD measurement indicated that the W nanowires exhibited an average lattice strain of about 1.50 %,whereas the TEM examination revealed a local elastic strain of about 4.59 % in areas adjacent to the TiNi matrix where stress-induced martensitic transfo rmation occurred.This strain corresponds to a stress of ~15 GPa for the W nanowires.In addition,in areas adjacent to the TiNi matrix where plastic deformation and cracking were generated,the W nanowire showed significant ductile necking with ~80 % reduction in cross-section area.The ductile necking of W nanowire is attributed to the lack of protection from the stress-induced martensitic transformation of the TiNi matrix.展开更多
基金supported financially by the National Natural Science Foundation of China(Nos.51571212,51731010,51831006 and 51971243)the Australian Research Council(Nos.DP180101955 and DP180101744)。
文摘The deformation behaviors of W nanowires embedded in a TiNi matrix were investigated by means of in-situ synchrotron high energy X-ray diffraction(HEXRD) and in-situ transmission electron microscopy(TEM) analysis during tensile deformation.The HEXRD measurement indicated that the W nanowires exhibited an average lattice strain of about 1.50 %,whereas the TEM examination revealed a local elastic strain of about 4.59 % in areas adjacent to the TiNi matrix where stress-induced martensitic transfo rmation occurred.This strain corresponds to a stress of ~15 GPa for the W nanowires.In addition,in areas adjacent to the TiNi matrix where plastic deformation and cracking were generated,the W nanowire showed significant ductile necking with ~80 % reduction in cross-section area.The ductile necking of W nanowire is attributed to the lack of protection from the stress-induced martensitic transformation of the TiNi matrix.
