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利用Rietveld方法对三元体系Ce-Al-Cu(<50%(原子分数)Cu)中的化合物晶体结构进行修正,验证该体系在传统高频电弧熔炼条件下所得的熔铸合金存在16个单相。利用精修得到的晶体结构参数对其熔铸态固溶度范围进行了计算,发现Cu在Al,α-Ce3Al11,CeAl3和CeAl2中的最大固溶度依次是(原子分数)2.48%,1.6%,3.7%和5.3%,Al在CeCu5中的最大固溶度为44.1%,Al2Cu和AlCu的固溶度区域分别为(原子分数)32.1%~32.7%Cu和53.5%~57.3%Cu。证实在熔铸态下研究的体系中存在5个三元化合物:CeAl12-xCux(4.0≤x≤4.53),CeAl4-xCux(0.73≤x≤1.10),Ce2Al17-xCux(6.49≤x≤7.87),CeAl13-xCux(6.62≤x≤6.92)和Ce2AlCu2,而Al92Ce8,Al3Cu2和CeAlCu并不存在。
The Rietveld method was used to modify the crystal structure of the compound in ternary system Ce-Al-Cu (<50% (atomic fraction) Cu) to verify the existence of 16 single-phase . The results show that the maximum solubility of Cu in Al, α-Ce3Al11, CeAl3 and CeAl2 are 2.48% (atomic fraction), 1.6% 3.7% and 5.3% respectively. The maximum solid solubility of Al in CeCu5 is 44.1%. The solid solubility of Al2Cu and AlCu are 32.1% -32.7% Cu and 53.5% -57.3% Cu, respectively. It is confirmed that there are five ternary compounds in the system studied in the melt casting: CeAl12-xCux (4.0≤x≤4.53), CeAl4-xCux (0.73≤x≤1.10), Ce2Al17-xCux (6.49≤x≤7.87), CeAl13 -xCux (6.62≤x≤6.92) and Ce2AlCu2, while Al92Ce8, Al3Cu2 and CeAlCu are not present.