An investigation on the compressive strength enhancing mechanism of directionally solidified Ti-47Al-2Nb-2Cr-0.2Er alloy in case of cyclic loading

An investigation on the compressive strength enhancing mechanism of directionally solidified Ti-47Al-2Nb-2Cr-0.2Er alloy in case of cyclic loading
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循环加载下定向凝固Ti-47Al-2Nb-2Cr-0.2Er合金抗压强度增强机制研究

DOI:
10.1016/j.msea.2017.03.048
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发表时间:
2017-04
期刊:
Materials Science & Engineering A
影响因子:
--
通讯作者:
Hengzhi Fu
Hengzhi Fu
中科院分区:
其他
文献类型:
--
作者:
Qiang Wang;Hongsheng Ding;Hailong Zhang;Ruirun Chen;Jingjie Guo;Hengzhi Fu

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本文研究了定向凝固Ti-47 Al-2Nb-2Cr-0.2Er合金在单次和循环载荷作用下的组织演变和压缩强度。结果表明,压缩变形可引起层状组织的弯曲,且这种弯曲的程度随压缩应变的增加而加剧。与相同应变的单次加载试样相比,循环加载试样的位错密度提高,抗压强度提高。Peierls应力的增强、位错间的长程弹性相互作用和微动量的增加都有助于循环加载样品的更高强度。在室温压缩过程中,位错环从半共格界面释放是主要的位错增殖机制。
In the present study the microstructure evolutions and compressive strengths of the directionally solidified Ti-47Al-2Nb-2Cr-0.2Er alloy undergoing single and cyclic loadings are studied. It is found that bending in lamellar structure can be caused by compression and the extent of this bend exacerbates with the increase of compression strain. For the sample under cyclic-loading, the density of dislocation is improved, resulting in a higher compressive strength in comparison with the sample subjected to single loading with the same strain. Enhancements of Peierls stress, long-range elastic interactions between dislocations, and jog quantity all contribute to the higher strength of the cyclic-loading sample. Dislocation loops releasing from the semi-coherent interfaces under the applied stress are the main dislocation multiplication mechanism during the room temperature compression.
Ti~45Al~8Nb合金定向凝固过程中的微观组织演变
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