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Influence of morphological parameter on the mechanical properties in a heterostructured medium Mn steel

Zhang Yu, Li Huaying, Zhou Xuedong, Jiang Zhouhua, Ding Hua

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e189, 2023

The heterostructured medium Mn steels with different volume fractions of heterostructure are fabricated via partially austenite reversed transformation (PART), and the influence of morphological parameter on the mechanical properties of the investigated steel is discussed. The PART samples exhibit the enhanced yield strength and ultimate tensile strength without sacrificing the ductility in comparison with their homogeneous counterpart. The double heterogeneities of microstructure and composition are found in the PART samples, which should be responsible for the enhancement in the mechanical properties. The yield strength and the ultimate tensile strength of the PART samples decrease with the increasing holding time at the partially austenized temperature, which is associated with the enhanced grain size and the elevated volume fraction of the lath-type microstructure.

Synthesis of single-crystalline Pb(Zr0.52Ti0.48)O3 nanocrystals by hydrothermal method

Deng Chunyu, Qin Chaoran, Li Xinyi, Li Shaoqing, Huang Zhixiong, Zhang Lianmeng, Zhou Xuedong, Guo Dongyun, Ju Yang

Materials Science Poland

2019

Vol. 37, No. 3

473--481

PbZr0.52Ti0.48O3 nanocrystals were synthesized by a hydrothermal method. The effect of NaOH concentration, reaction temperature and time on nucleation and growth of PbZr0.52Ti0.48O3 nanocrystals was investigated. As the 0.05 mol/L PbZr0.52Ti0.48O3 precursors were heated at 200 °C for 21 h with NaOH concentration of 0.5 mol/L, the tetragonal PbZr0.52Ti0.48O3 nanocrystals were formed, and the grain size was more than 20 nm. With increasing the NaOH concentration from 0.5 to 1.5 mol/L, the grain size of PbZr0.52Ti0.48O3 nanocrystals decreased. When the precursors were heated at different temperatures (140 °C to 200 °C) for 21 h with 1.0 mol/L NaOH, single-phase PbZr0.52Ti0.48O3 nanocrystals were obtained at 160 °C to 200 °C. With increasing the reaction temperature from 160 °C to 200 °C, the grains size of PbZr0.52Ti0.48O3 nanocrystals increased from 5 nm to 9 nm. When the precursors were heated at 160 °C in different reaction times from 6 h to 21 h, the evolution from amorphous to crystalline PbZr0.52Ti0.48O3 nanocrystals in correlation with the reaction time was observed. Single crystalline PbZr0.52Ti0.48O3 nanocrystals with narrow size distribution (from 5 nm to 9 nm) were synthesized by controlling the NaOH concentration, reaction temperature and time. The obtained results can find potential application in preparing PbZr0.52Ti0.48O3 thin films on flexible substrates.