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Post-yielding dislocation retraction of nano-lamellar TiAl single crystals

Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 74-82页

作者： HengGao Xiang WanLin Guo State Key Laboratory of Mechanics and Conirol of Mechanical Strucures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The perfect single crystal has ultra-high strength but is often accompanied by catastrophic failures after *** study reveals that nano-lamellar TiAl single crystals alleviate the catastrophic failure due to a post-yielding dislocation retraction through atomistic simulations and theoretical *** dislocation retraction leads to a retained post-yielding strength of1.03 to 2.33 GPa(about 50%of the yielding strength).It is shown that this dislocation retraction is caused by local stress relaxation and interface-mediated image *** local stress relaxation is due to successive dislocation nucleation in different slip systems,and the interface-mediated image force is caused by the heterogeneous *** on dislocation theory,this study demonstrates that the size effect also plays a vital role in dislocation *** modeling shows that the dislocation retraction occurs when the lamellar thickness is less than approximately 12 ***,the post-yielding dislocation retraction is more pronounced at higher temperatures,making it more effective in alleviating catastrophic *** findings demonstrate a viable option for avoiding catastrophic failure of single crystals through nanoscale-lamellar design.

关键词： post-yielding dislocation retraction single crystals nano-lamellar

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Revisiting anisotropy in the tensile and fracture behavior of cold-rolled316L stainless steel with heterogeneous nano-lamellar structures

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nano Materials Science 2020年第1期2卷 72-79页

作者： Zesheng You Huangliu Fu Shoudao Qu Weikang Bao Lei Lu Herbert Gleiter Institute of nanoscience Nanjing University of Science and TechnologyNajing210094China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesSheryang110016China

We produced a 316 L stainless steel with heterogeneous nanometer-thick lamellar structures by severe cold-rolling at room temperature,and conducted micro-scale tensile tests in different orientations to evaluate both the inplane(parallel to the nano-lamellae)and out-of-plane(normal and 45inclined to the nano-lamellae)mechanical *** parallel orientation demonstrates the greatest tensile strength while the inclined orientation exhibits the least *** tensile tests in normal and inclined directions also indicate significant transient elastic-plastic response due to the strain path *** examination demonstrates that the specimen fails in the normal direction by premature micro-void nucleation and growth,which restricts its tensile strength;however,we identified zig-zag cracking associated with lamellar shear cracking in the inclined direction.

关键词： Heterogeneous nano-lamellar structure Mechanical anisotropy Fracture behavior Specimen size effect Strain path effect

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