摘要
The deformation mode of{332}<113>twinning(hereafter called 332T)has often been observed under the plastic flow in metastableβtitanium alloys with body-centered cubic(BCC)structure,which contributes to improving the mechanical performance.Herein,we report a structure of compressive deformation-induced primary 332T with hierarchical and/or heterogeneous composite sub-structure in a Twin-Induced Plasticity(TWIP)βTi-alloy under uniaxial compression.The detailed structural characterization after compressive deformation revealed that the sub-structure,including secondary 332T and secondary{112}<111>twinning,formed inside the 332T structure,which constitutes a hierarchical and/or heterogeneous structure at micro-and nano-scale and consequently contributes to the high strength,large ductility and enhanced strain-hardening behavior.
基金
supported by the Fund of State Key Lab of Advanced Metals and Materials,University of Science and Technology Beijing(No.2019-ZD03)
the Fund of the State Key Laboratory of Solidification Processing,Northwestern Polytechnical University(No.SKLSP201501)
the National Natural Science Foundation of China(Nos.51601216 and 51901193)
the Fundamental Research Funds for the Central Universities(Nos.2017XKQY009 and 2018GF13)
sponsored by China Scholarship Council。
