Microstructure evolution, crystallography, nanomechanical properties and wear-resistance of multi-component M2B in Fe–B alloy
Microstructure evolution, crystallography, nanomechanical properties and wear-resistance of multi-component M2B in Fe–B alloy
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DOI：
10.1557/s43578-022-00543-z
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发表时间：
2022-04
影响因子：
2.7
通讯作者：
Suocheng Song;Yanliang Yi;J. Xing;H. Fu
中科院分区：
文献类型：
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作者：
Suocheng Song;Yanliang Yi;J. Xing;H. Fu
为了研究Fe-B合金中多元硼化物的基本特性，采用定向凝固法制备了样品，并对多元M2B的显微组织演化、晶体学、纳米力学性能和耐磨性能进行了系统研究。结果表明，硼化物按照富Mo→富Fe→富Cr的M2B的顺序生长。富钼M2B具有体心四方(bct)结构，化学计量为Fe0.72Cr0.27Mo0.80(B,C)，富铁M2B具有bct结构，化学计量为Fe1.59Cr0.38Mo0.08(B,C)，富铬M2B具有体心斜方(bco)结构，化学计量为Fe1.48Cr0.50Mo0.02(B、C)。此外，与Cr的添加相比，Mo的添加可以促进M2B中更多的位错。因此，富Mo M2B 具有最好的刚度和韧性，其次是富Cr M2B，然后是富Fe M2B。此外，富Mo和富Cr的M2B相对于富Fe的M2B可以具有更高的耐磨性。
To investigate the basic characteristics of multi-component boride in Fe–B alloy, the samples were prepared by directional solidification, and then the microstructural evolution, crystallography, nanomechanical properties and wear-resistance of multi-component M2B have been systematically studied. The results show that the boride grows in the sequence of Mo-rich → Fe-rich → Cr-rich M2B. The Mo-rich M2B has the body centered tetragonal (bct) structure with stoichiometry of Fe0.72Cr0.27Mo0.80(B,C), the Fe-rich M2B possesses the bct structure with stoichiometry of Fe1.59Cr0.38Mo0.08(B,C), while the Cr-rich M2B owns the body centered orthorhombic (bco) structure with stoichiometry of Fe1.48Cr0.50Mo0.02(B,C). Moreover, the Mo addition can facilitate more dislocations in the M2B compared to the Cr addition. Thus, the Mo-rich M2B has the best stiffness and toughness, followed by the Cr-rich M2B and then the Fe-rich M2B. Additionally, the Mo-rich and Cr-rich M2B can possess higher wear-resistance relative to the Fe-rich M2B.