Chemical fluctuation of Ti-Zr isomorphous alloy obtained by rapid quenching
Chemical fluctuation of Ti-Zr isomorphous alloy obtained by rapid quenching
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快速淬火Ti-Zr同质合金的化学波动
DOI：
10.1007/bf01689313
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
M. Misawa
中科院分区：
文献类型：
--
作者：
T. Fukunaga;Shinobu Shibuya;Kenji Suzuki;M. Misawa
图1所示的相图表明，Ti-Zr合金体系在整个浓度范围内是类质同象的。无成分偏析的类质同晶合金可通过快速淬火使液态的化学原子构型冻结而获得。特别地，成分Ti 37 at.%的同成分熔融合金，Zr将呈现类质同晶状态。然而，在文献中没有关于原子位置是否被钛或锆原子随机占据的报道，即在Ti-Zr类质同晶合金中没有原子水平的化学波动。当Ti含量为32.44at.%时，可获得中子零散射合金由于钛和锆原子的相干中子散射振幅分别为-0.3438和0.716× 10 ~（-1）tZcm，在同成分熔化合金附近，Zr的中子散射强度与合金的中子散射强度成正比。使用该Ti 32.44原子% Zr中子零散射合金用中子散射实验直接观测到了Ti-Zr类质同象合金中原子水平的浓度涨落。在这封信中，我们报告钛和锆原子是否随机分布在该合金中。Ti 32.44 at.%在氩气保护下，采用悬浮炉单辊快淬技术，从熔融态制备Zr类晶合金，得到长约3 m、厚约30 μ m、宽约2 mm的长带。这种同晶合金显示出相的混合物（bcc，
The phase diagram shown in Fig. 1 indicates that the Ti-Zr alloy system is isomorphous over the total concentration range. The isomorphous alloy without the compositional segregation may be obtained by freezing the chemically atomic configuration of the liquid state by rapid quenching. In particular, the congruently melting alloy of composition Ti 37at.% Zr will exhibit the isomorphous state. However, there is no report in the literature concerning whether the atom sites are randomly occupied by titanium or zirconium atoms, that is, that there is no chemical fluctuation in atomic level in the Ti-Zr isomorphous alloy. A neutron zero-scattering alloy can be obtained at the composition Ti 32.44 at.% Zr in the vicinity of the congruently melting alloy, because the coherent neutron scattering amplitudes of titanium and zirconium atoms are-0.3438 and 0.716× 10-tZcm, respectively. Using this Ti 32.44 at.% Zr neutron zero-scattering alloy the concentration fluctuation in atomic level in the Ti-Zr isomorphous alloy is directly observed by a neutron scattering experiment. In this letter we report whether or not titanium and zirconium atoms are distributed at random in this alloy. The Ti 32.44 at.% Zr isomorphous alloy was prepared by rapid quenching from the molten state using a single-roll technique with a levitation furnace under argon-gas atomosphere, to produce a long ribbon about 3 m long, 30/~ m thick and 2 mm wide. This isomorphous alloy showed a mixture of phases (bcc at