合金元素在Ni_3Si中的固溶行为

SOLUTION BEHAVIOUR OF VARIOUS ALLOYING ELEMENTS IN Ni_3 Si

测定15种常见合金元素在Ll_2型金属间化合物Ni_3Si中900℃时的固溶度,并由相区扩展方向推估其取代方式。研究表明,它们在Ni_3Si中的固溶行为由尺寸因素和电子因素决定。即,取代行为由电子结构决定,固溶度由原子半径和电子结构共同决定。找到了一个能定量反映电子结构对取代方式影响的参数-相互作用参数,利用该参数定量地判断元素取代方式,并与原子半径一起成功地从半定量上说明固溶度大小。

The solid solubilities of 15 common alloying elements added to theLl_2-type intermetallic compound Ni_3Si at 900℃ have been estimated, and their sub-stitution modes have been deduced from the direction of solubility lobe of the com-pound. It is shown that the alloying behaviours in Ni_3Si are determined by bothsize and electronic factors, i. e., the substitution behaviour by electronic configura-tion and solubility by the both. An interaction parameter is presented to describequantitatively the influence of electronic configuration on substitution behaviour andthe solubility limit can be successfully explained together with atom radii.