A nanocrystal model for liquid metals and amorphous metals has been developed.With the nanocrystal model,the broadening peak profiles(BPPs)of Cu,Al,Al65Cu20Fe15 alloy,Cu7oNi30 alloy and Fe50Si50 alloy were gained by b...A nanocrystal model for liquid metals and amorphous metals has been developed.With the nanocrystal model,the broadening peak profiles(BPPs)of Cu,Al,Al65Cu20Fe15 alloy,Cu7oNi30 alloy and Fe50Si50 alloy were gained by broadening the X-ray diffraction(XRD)peaks of a crystal lattice.By comparing the BPPs with the XRD intensity curves measured on the liquid metals,it is found that the BPPs are closely in agreement with the XRD intensity curves,respectively,except the FesoSiso alloy.Therefore,the nanocrystal model can be used to determine if the atomic cluster structure of the liquid metal is similar to the structure of its crystal lattice.展开更多
Dependence of the morphology of α(Al)-Mg2Si eutectic on the solidification velocity, and its orientation characteristics were investigated by thermoanalysis, directional solidification and electron diffraction techni...Dependence of the morphology of α(Al)-Mg2Si eutectic on the solidification velocity, and its orientation characteristics were investigated by thermoanalysis, directional solidification and electron diffraction techniques in this study.The eutectic morphology transformed from lamellae to rods with the increasing of the solidification velocity. Simultaneously, the orientation relationship changed from (100)Mg2Si/(100)Al;[110]Mg2si/[110]al to (011)Mg2si/(121)Al;[111]Mg2Si/[111]Al and (010)Mg2Si/(110)Al; [100]Mg2Si/[111]Al. Transformation of the eutectic morphology was related to the change of the preferred orientation of phase Mg2si.展开更多
基金supported by the National NaturalScience Foundation of China(Grant Nos.50971083,50395101 and 50571052)
文摘A nanocrystal model for liquid metals and amorphous metals has been developed.With the nanocrystal model,the broadening peak profiles(BPPs)of Cu,Al,Al65Cu20Fe15 alloy,Cu7oNi30 alloy and Fe50Si50 alloy were gained by broadening the X-ray diffraction(XRD)peaks of a crystal lattice.By comparing the BPPs with the XRD intensity curves measured on the liquid metals,it is found that the BPPs are closely in agreement with the XRD intensity curves,respectively,except the FesoSiso alloy.Therefore,the nanocrystal model can be used to determine if the atomic cluster structure of the liquid metal is similar to the structure of its crystal lattice.
文摘Dependence of the morphology of α(Al)-Mg2Si eutectic on the solidification velocity, and its orientation characteristics were investigated by thermoanalysis, directional solidification and electron diffraction techniques in this study.The eutectic morphology transformed from lamellae to rods with the increasing of the solidification velocity. Simultaneously, the orientation relationship changed from (100)Mg2Si/(100)Al;[110]Mg2si/[110]al to (011)Mg2si/(121)Al;[111]Mg2Si/[111]Al and (010)Mg2Si/(110)Al; [100]Mg2Si/[111]Al. Transformation of the eutectic morphology was related to the change of the preferred orientation of phase Mg2si.
