Characterization of fracture toughness and toughening mechanisms in Laves phase Cr2Nb based alloys
Characterization of fracture toughness and toughening mechanisms in Laves phase Cr2Nb based alloys
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DOI：
10.1016/j.msea.2015.04.077
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发表时间：
2015-06
期刊：
影响因子：
6.4
通讯作者：
Y. Xue;S. M. Li;H. Zhong;H. Fu
中科院分区：
文献类型：
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作者：
Y. Xue;S. M. Li;H. Zhong;H. Fu
在1473K，48h的电弧熔炼和热处理条件下，研究了钛含量对Cr2Nb-20/30/40Ti(at.%)合金断裂韧性的影响。结果表明，随着钛含量的增加，合金的晶粒度减小，断裂韧性增加。热处理后，Cr2Nb-20/30Ti合金的断裂韧性提高了近一倍，韧化机制主要为裂纹桥联，而Cr2Nb-40Ti合金的断裂韧度提高了77%，达到18.80 Mpa·m1/2，韧化机制向裂纹缺陷转变。热处理过程中形变约束的消除对提高合金的断裂韧性是有效的。
The effect of Ti content on the fracture toughness of the Cr2Nb–20/30/40Ti (in at.%) alloys has been investigated in the arc melting and heat treatment (1473 K for 48 h) conditions. The results show that the reduction of grain size and the facture toughness of the alloys increased with increasing the Ti content. After the heat treatment, the facture toughness of the Cr2Nb–20/30Ti alloys increased by almost twice, and the crack bridging was primarily observed as the toughening mechanism, and for the Cr2Nb–40Ti alloy, the fracture toughness increased by 77% and reached 18.80 MPa m1/2, and the toughening mechanism transited to the crack defection. The alleviation of deformation constraint during the heat treatment was elucidated to be effective in improving the fracture toughness of the alloys.