Unravelling the competitive effect of microstructural features on the fracture toughness and tensile properties of near beta titanium alloys

作     者：Yang Liu Samuel C.V.Lim Chen Ding Aijun Huang Matthew Weyland Yang Liu;Samuel C.V.Lim;Chen Ding;Aijun Huang;Matthew Weyland

作者机构：Department of Materials Science and EngineeringMonash UniversityClaytonVIC3800Australia Monash Centre for Additive ManufacturingMonash UniversityNotting HillVIC3168Australia BAOWU Special Metallurgy Co.Ltd.Shanghai200940China Monash Centre for Electron MicroscopyMonash UniversityClaytonVIC3800Australia 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第97卷第2期

页      面：101-112页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the financial support from Baosteel Australia Joint Research Centre(BA16003) ARC Research Hub for Computational Particle Technology(IH140100035) funded by Australian Research Council grant LE0882821 

主　　题：Nearβtitanium alloys Microstructural features Competitive effect Fracture toughness βgrain size effect 

摘      要：The competitive effect of microstructural features including primaryα(α_(p)),secondaryα(α_(s)),grain boundaryα(α_(GB)) and β grain size on mechanical properties of a near β Ti alloy were studied with two heat treatment *** relative effect of β grain size and STA(solution treatment and ageing)processing parameters on mechanical properties were quantitatively explored by the application of Taguchi *** results were further explained via correlating microstructure with the fracture toughness and tensile *** was found that large numbers of fine as precipitates and continuous α_(s) played greater roles than other features,resulting in a high strength and very low ductility(2%)of STA process *** β grain size had a negative correlation with fracture *** the samples prepared by BASCA( β anneal slow cooling and ageing)process,improved ductility and fracture toughness were obtained due to a lower density ofα;precipitates,a basket-weave structure and zigzag morphology of α_(GB).For this heat treatment,an increase in prior β grain size had an observable positive effect on fracture *** contradictory effect of β grain size on fracture toughness found in literature was for the first time *** was shown that the microstructure obtained from different processes after β solution has complex effect on mechanical *** complexity derived from the competition between microstructure features and the overall sum of their effect on fracture toughness and tensile properties.A novel table was proposed to quasi-quantitatively unravel these competitive effects.