Ductility Enhancement in B2-Type Zr-Co-Ni Alloys with Martensitic Transformation
Ductility Enhancement in B2-Type Zr-Co-Ni Alloys with Martensitic Transformation
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DOI：
10.2320/matertrans.m2009182
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发表时间：
2009-09
影响因子：
1.2
通讯作者：
M. Matsuda;K. Hayashi;M. Nishida
中科院分区：
文献类型：
--
作者：
M. Matsuda;K. Hayashi;M. Nishida
研究了三元Zr-Co-Ni合金的显微组织和力学性能之间的关系。室温X射线衍射测量表明，当Ni取代Co的量超过14%时，Zr50Co50�xNix合金会发生从B2结构到B33结构的马氏体转变。当Ni取代量达到13%时，拉伸强度和伸长率显着增加。特别是Zr50Co39Ni11合金具有23%的极高总伸长率。除了断裂区附近的 h100i 型 Burgers 矢量位错外，还存在许多 f021gB33 形变孪晶。这些孪晶被认为是变形诱导马氏体的内部缺陷，其具有约430 Hv的高硬度。因此，得出结论：Zr-Co-Ni合金延展性的显着增强是由于相变诱导塑性所致。 [doi:10.2320/matertrans.M2009182]
The relationship between the microstructures and mechanical properties in the ternary Zr-Co-Ni alloys has been investigated. X-ray diffraction measurements at room temperature show that Zr50Co50� xNix alloys undergo martensitic transformation from the B2 to B33 structures by the substitution amounts of Ni above 14% for Co. The tensile strength and elongation increase remarkably by substituting Ni up to 13%. Especially, the Zr50Co39Ni11 alloy has the extremely high total elongation of 23%. There are many f021gB33 deformation twins in addition to the dislocations with the h100i-type Burgers vector just near the fractured area. These twins are considered to be an internal defect of the deformation induced martensite which has high hardness about 430 Hv. Therefore, it is concluded that the remarkable enhancement of the ductility of Zr-Co-Ni alloys is due to the transformation induced plasticity. [doi:10.2320/matertrans.M2009182]