Room temperature fracture of FeCo
Room temperature fracture of FeCo
复制标题
FeCo 的室温断裂
DOI：
10.1557/proc-288-501
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
E. George
中科院分区：
文献类型：
--
作者：
L. Zhao;I. Baker;E. George
FeCo是一种经历有序-无序转变的B2金属间化合物。本文介绍了化学无序和热无序的变化对FeCo室温断裂的影响。对FeCo[sub30]CO[sub70]、Fe[sub50]CO[sub50]和Fe[sub70]CO[sub30]三种成分进行了拉伸试验。用扫描电子显微镜观察了断口形貌，用俄歇电子能谱、俄歇电子能谱研究了晶界化学成分。有序的Fe[sub50]Co[sub50]和Fe[sub70]CO[sub30]非常争斗，断裂发生在屈服之前，大部分沿晶断裂发生在大部分晶粒中。相反，有序Fe[sub30]Co[sub70]的延伸率约为18%，表现为韧窝状断口。研究还发现，无序改善了各成分的延性，但对断裂方式影响不大。俄歇电子能谱分析表明，在晶界存在较低程度的硫偏析，表明硫偏析本身并不是有序合金脆性行为的原因。
FeCo is a B2 intermetallic compound which undergoes an order-disorder transformation. In this paper, the effects of changes in both constitutional and thermal disorder on the room temperature fracture of FeCo are presented. Tensile tests were performed on three compositions of FeCo, Fe[sub 30]CO[sub 70], Fe[sub 50]CO[sub 50] and Fe[sub 70]CO[sub 30]. The resulting fracture surfaces were examined by SEM and the grain boundary chemistry was investigated by Auger electron spectroscopy, AES. Ordered Fe[sub 50]CO[sub 50] and Fe[sub 70]CO[sub 30] were very battle, fracture occurring before yielding, with intergranular fracture occurring in most grains. In contrast, ordered Fe[sub 30]CO[sub 70] showed about 18% elongation and exhibited a dimple-type fracture. It was also found that disordering improved the ductility of each composition but had little influence on the fracture mode. AES showed that a low level of sulfur segregation was present at the grain boundaries, suggesting that sulfur segregation alone was not responsible for the brittle behavior of the ordered alloys.