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关于碳合金化高熵合金的韧脆转变机制的文章在 Intermetallics 发表
发布者: 江峰 | 2024-04-22 | 33
The mechanism of ductile-brittle transition in carbon alloyed
Fe40Mn40Co10Cr10 medium entropy alloys
 
Liangbin Chen a , Zhongyue Yang b , Yaohui Li a , Yanpu Chao a , Yuhang Shi b , Ke Tang b , Ran Wei c,* , Feng Jiang b,**
a School of Electrical and Mechanical Engineering, Xuchang University, Xuchang, 461000, China
b State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China
c School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China
In this work, the uniaxial tensile tests were conducted on Fe40Mn40Co10Cr10, (Fe40Mn40Co10Cr10)98.5C1.5,
(Fe40Mn40Co10Cr10)96.7C3.3 and 0.4 wt% Ti doped (Fe40Mn40Co10Cr10)96.7C3.3 at 298K, 159K and 77K. Mean
while, the corresponding deformation microstructures as well as the variations of critical shear stress (τ0) and
critical normal stress (σ0) were analyzed to unveil the mechanism of ductile-brittle transition (DBT) behavior in
carbon alloyed face-centered cubic (FCC) medium/high entropy alloys (M/HEAs). The results show that DBT
behavior featured by drastic reduction of ductility with decreasing temperature indeed occurs in (Fe40Mn40
Co10Cr10)96.7C3.3. The slightly increased τ0 and the abnormally decreased σ0 at 77K lead to the premature normal fracture of (Fe40Mn40Co10Cr10)96.7C3.3. Severe dislocation pile-ups near grain boundaries due to significantly reduced deformation twinning at 77K is responsible for the embrittlement of  Fe40Mn40Co10Cr10)96.7C3.3. These findings provide deep insights into DBT behavior of carbon alloyed FCC M/HEAs.
 
 
毕业生陈良斌为第一作者单位（许昌学院），交大杨中岳，史雨航、唐可为共同作者，郑州大学（第三单位）魏然和 交大（第二单位）江峰教授为共同通讯作者。
 
 
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