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Microstructure and properties of gradient nitrided layer on Ti6Al4V alloys

Rare Metals 2023年第2期42卷 651-663页

作者： Feng Yang Kun-Mao Li Xing-Jun Liu Hong Sun Cui-Ping Wang College of Materials and Fujian Key Laboratory of Materials Genome and Xiamen Key Laboratory of High Performance Metals and Materials Xiamen UniversityXiamen361005China School of Materials and Architectural Engineering Guizhou Normal UniversityGuiyang550001China Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyTokyo184-8588Japan

The vacuum electromagnetic induction nitriding technology was applied to prepare a gradient nitrided layer on the surface of a Ti6Al4V alloy,which possesses TiN andα-Ti(N)***,transmission electron microscopy was conducted to confirm the presence of numerous high-density stacking faults caused by TiN and Ti_(2)N phases distributed on the surface of the alloy,along with a large number of basal stacking faults inside.A highdensity stacking fault led to serious distortion of lattice *** and numerous edge dislocations caused by defects were observed in the subsurface *** the surface layer,the Vickers hardness reached HV_(0.25)1211.30and the residual compressive stress increased,while the nano-hardness increased to 14.07 from 5.31 GPa in the *** micrometre scratch test results indicated that the plasticity and hardness of the nitrided layer changed in a *** 50-μm effective hardened layer depth and surface compressive stress of the Ti6Al4V alloy were enhanced by the stacking faults.

关键词： Ti6Al4V Induction nitriding gradient layer High-density dislocation Strengthening mechanism

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gradient nanostructured tungsten and the thermal shock response

引用

Tungsten 2023年第4期5卷 548-557页

作者： Yan Jiang Ping Huang Zhi-Qiang Jiang Jing Hou Zhong Xu En-Hui Wu Jun Li Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua UniversityPanzhihua617000China

In fusion reactor or spallation neutron source environment,damage of tungsten components begins at the *** enhance the surface toughness,strength,and hardness of tungsten,a nano-to-micro sc ale lamellar gradient surface layer(thickness up to~50μm)was produced on as-rolled pure tungsten using a dry-sliding surface *** dry-sliding temperature and time were established by observing the grain-size evolution from room temperature to 750℃and the coefficient of friction on the surface layer after sliding from 10 to 50 *** grains changed into a slender fibrous structure at 250℃,which is higher than the ductile-brittle transition temperature but lower than the dynamic recrystallization temperature(750℃).The coefficient of friction of the surface layer decreased with sliding time and stabilized at approximately 50 min,indicating near-s aturation of the surface *** repetitive thermal loads of 10,20,and 30 MW·m^(-2)on the gradient modified layer,it exhibited mainly recrystallization and grain *** proportion of low-angle grain boundaries(gradient layer could suppress the formation of pits and protrusions in the as-rolled tungsten sample.

关键词： gradient layer Tungsten Dry sliding Coefficient of friction

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维普期刊数据库

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