Monocrystalline elastic constants and their temperature dependences for equi-atomic Cr-Mn-Fe-Co-Ni high-entropy alloy with the face-centered cubic structure
Monocrystalline elastic constants and their temperature dependences for equi-atomic Cr-Mn-Fe-Co-Ni high-entropy alloy with the face-centered cubic structure
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DOI：
10.1016/j.jallcom.2018.11.052
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发表时间：
2019-03
影响因子：
6.2
通讯作者：
T. Teramoto;Kazuki Yamada;Ryo Ito;Katsushi Tanaka
中科院分区：
文献类型：
--
作者：
T. Teramoto;Kazuki Yamada;Ryo Ito;Katsushi Tanaka
用共振超声光谱测量了面心立方(Fcc)结构的Cr-Mn-Fe-Co-Ni系高熵合金从液氦温度到1173 K的单晶弹性常数随温度的变化关系，并用Varshni方程对三个独立的单晶弹性常数和估算的多晶弹性常数进行了拟合，从而可以得到任意温度下的单晶弹性常数。该合金的弹性各向异性以较大的剪切模数各向异性因子为特征，这与该合金较小的层错能密切相关。单晶弹性常数也表明，目前的高熵合金中存在较强的定向原子间成键。
The temperature dependences of monocrystalline elastic constants of Cr-Mn-Fe-Co-Ni high entropy alloy with the face-centered cubic (fcc) structure have been experimentally determined using resonance ultrasound spectroscopy from liquid helium temperature to 1173 K. The values of three independent monocrystalline and estimated polycrystalline elastic constants are fitted using the Varshni equation so that one can obtain the values at any temperatures. The elastic anisotropy of the alloy is characterized by a relatively large value of anisotropy factor of shear modulus, which is closely related to a small value of stacking fault energy of this alloy. The monocrystalline elastic constants also indicate that a relatively strong directional interatomic bonding exists in the present high-entropy alloy.