Mechanical Properties Improvement of CoCrFeMnNiB0.1
High Entropy Alloy through Annealing Design |
Lili Hou, Jiatao Hui, Yuhong Yao, Jian Chen* and Jiangnan Liu
Pages : 100-105
DOI :10.1080/0371750X.2020.1755365 |
Abstract |
ABSTRACT
XRD results show that diffraction peak of M3B is gradually apparent with the increase of
annealing temperature and time, which indicates that annealing can promote the
formation of M3B phase. The increase of annealing temperature and time leads to
transformation of inter dendritic microstructure from long strip Cr3B phase to granular
Cr3B phase. Particularly, after annealing at 1100oC for 20 h, the particles of Cr3B phase are
distributed homogeneously in the matrix FCC phase, but the number of Cr3B phase
decreases evidently. After annealing at 1100oC for 20 h, the yield strength and tensile
strength of the alloy become 412 MPa and 797 MPa, having increments of 64.1% and
70.7%, respectively, compared to the as-cast alloys. However, the elongation remains
the same as the cast alloy. After annealing, the particles of Cr3B phase are uniformly
distributed in the FCC matrix and some B elements are dissolved into dendritic structure
which results in significant increase of strength in the form of dispersion strengthening
and solution strengthening. TEM images of the samples depict that after annealing
certain deformation twins are observed, which lead to the maintenance of plasticity.
[Keywords: High-entropy alloys, Annealing, Microstructure, Mechanical properties] |
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