Medium-range order clusters in metal melts

来源 :Science in China(Series E:Technological Sciences) | 被引量 : 0次 | 上传用户:z1750691
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Structures of molten metals Cu and Al, alloys Cu-Al, Al-Ni, Al-Fe and, Al-Si were investigated by using high temperature X-ray diffractometer. It has been found that there are not only short-range order structures (SRO) but also medium range order structures (MRO) in Cu-Al, Al-Ni, Al-Fe alloy melts. There are only short-range order structures in the pure metals Cu and Al and Al-Si alloy melts at different temperatures. It has also been found that the presence and the disappearance of the MRO structures in molten metals are a function of temperature. Moreover, the pre-peak in the structure factor is an indication of MRO in molten metals. There is a pre-peak in each structure factor S( Q) of Al-Fe alloy melt containing 14 wt% Fe, 16 wt% Fe and 19 wt% Fe at 1550℃, showing that there are the medium range order structures in these alloy melts. For Al-35wt% Ni alloy, the pre-peak exists in S(Q) when the temperature is lower than 1300?, and it is weakened drastically when the temperature surpasses 1300℃. The Structures of molten metals Cu and Al, alloys Cu-Al, Al-Ni, Al-Fe and Al-Si were investigated by using high temperature X-ray diffractometer. It has been found that there are not only short- range order structures (SRO) but also medium range order structures (MRO) in Cu-Al, Al-Ni, Al-Fe alloy melts. There are only short-range order structures in the pure metals Cu and Al and Al-Si alloy melts at different It has also been found that the presence of the disappearance of the MRO structures in molten metals are a function of temperature. Moreover, the pre-peak in the structure factor is an indication of MRO in molten metals. showing that there are the medium range order structures in these alloy melts. For Al (Fe) 2, each Al-Fe alloy melt containing 14 wt% Fe, 16 wt% Fe and 19 wt% Fe at 1550 ° C -35 wt% Ni alloy, the pre-peak exists in S (Q) when the temperature is lower than 1300 ?, and it is weakened drastically when the temperature su rpasses 1300 ℃
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