Unveiling the correlation between anomalous hardening and grain boundary diffusional transformation inωsingle-phase nano-grained Ti-Fe alloy  

作　　者：Shangshu Wu Zongde Kou Song Tang Si Lan Qingquan Lai Junjie Wang Jinru Luo Xuefeng Xie Rong Huang Guiyuan Zheng Gerhard Wilde Tao Feng 

机构地区：[1]Herbert Gleiter Institute of Nanoscience,School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [2]Suzhou Laboratory,Suzhou 215123,China [3]Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 211816,China [4]Xi’an Rare Metal Materials Institute Co.Ltd,Xi’an 710016,China [5]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China [6]Weihai Langu Institute for Materials Analysis Co.Ltd.,Weihai 264207,China [7]Institute of Materials Physics,University of Muenster,Wilhelm-Klemm Str.10,Muenster,48149,Germany

出　　处：《Journal of Materials Science & Technology》2024年第36期53-60,共8页材料科学技术(英文版)

基　　金：the National Natural Science Foundation of China(Nos.52301158,52101142,52001166,and 52171052);the financial support of the National Key R&D Pro-gram of China(No.2021YFB3802800);the Natural Science Foun-dation of Jiangsu Province(Nos.BK20210352 and BK2020019);the Fundamental Research Funds for the Central Universities(Nos.30923011004 and 30919011404).

摘　　要：A metastableωsingle-phase nanograined(NG)Ti-Fe alloy was synthesized using laser inert-gas conden-sation(IGC).Upon being annealed at 360℃,the NG Ti-Fe alloy exhibited a remarkable ultra-hardening,increasing the hardness from 4.7 to 8.6 GPa.Subsequent findings revealed an unexpected hardness en-hancement,rising from 6.6 GPa at 420℃ to 7.6 GPa at 460℃,despite the occurrence of grain growth.In-depth investigations into the strengthening mechanisms of the NG Ti-Fe alloy were conducted using in-situ synchrotron high-energy X-ray diffraction(XRD)and transmission electron microscopy(TEM).The comprehensive analysis unveiled that the diffusion-controlled structure evolution during annealing played a pivotal role in enhancing the alloy’s mechanical properties.This study not only presents the synthesis of a novel metastable alloy but also provides valuable insights into the intricate relationship between diffusion-controlled structure evolution and the resulting superior mechanical properties.

关 键 词：Laser-inert gas condensation Nanograined Ti-Fe alloy Phase transformation Dislocations Strengthening 

分 类 号：TG1[金属学及工艺—金属学]