高应变率加载下新型近βTi-5553合金的组织结构与力学性能
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摘要
本文针对热处理对新型近βTi-5553合金组织与性能的影响开展研究,通过准静态、分离式霍普金森压杆(SHPB)动态压缩测试其静动态力学性能,采用OM、SEM进行微观组织结构观察。研究结果表明:准静态(应变率为10-3s-1)加载下,相比双态组织,等轴组织钛合金的强度较高,塑性变形能力相对较差,断口分析表明,两种组织钛合金均以韧窝为特征的韧性断裂。SHPB动态压缩(应变率为103s-1)加载后,材料表现出与准静态加载相似的规律,微观组织分析表明,高应变率加载下材料以绝热剪切为主要破坏形式。
The effect of heat treatment on the microstructures and mechanical properties of a new type near-beta Ti-5553 alloy was investigated. Quasi-static mechanical test and split Hopkinson pressure bar( SHPB) test were carried out to investigate the quasi-static and dynamic compressive behaviors of the alloy. Optical microscopy( OM) and scanning electron microscopy( SEM) were used to characterize the microstructure evolution. The experimental results demonstrated that the alloy with duplex microstructure exhibits higher strength than that with equal-axis microstructure under the quasi-static( 10- 3s- 1) compression,while the plastic deformation capacity of the alloy with duplex microstructure is relatively poor. Fromthe fracture morphologies,ductile dimple areas can be observed. After SHPB dynamic compression( 103s- 1) loading,the alloy exhibit similar rules compared with that with quasi-static loading. Through the microstructure analysis,we found that the damage failures of the materials with two microstructures are both adiabatic shear failure.
The effect of heat treatment on the microstructures and mechanical properties of a new type near-beta Ti-5553 alloy was investigated. Quasi-static mechanical test and split Hopkinson pressure bar( SHPB) test were carried out to investigate the quasi-static and dynamic compressive behaviors of the alloy. Optical microscopy( OM) and scanning electron microscopy( SEM) were used to characterize the microstructure evolution. The experimental results demonstrated that the alloy with duplex microstructure exhibits higher strength than that with equal-axis microstructure under the quasi-static( 10- 3s- 1) compression,while the plastic deformation capacity of the alloy with duplex microstructure is relatively poor. Fromthe fracture morphologies,ductile dimple areas can be observed. After SHPB dynamic compression( 103s- 1) loading,the alloy exhibit similar rules compared with that with quasi-static loading. Through the microstructure analysis,we found that the damage failures of the materials with two microstructures are both adiabatic shear failure.
引文
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[3]徐峰,计波,朱益藩,等.加工工艺对Ti5553合金等温锻件力学性能和显微组织的影响[J].中国有色金属学报,2010,20(1):100-103.XU Feng,JI Bo,ZHU Yifan,et al.Effect of process routes on mechanical properties and microstructure of Ti-5553 isothermal forgings[J].The Chinese Journal of Nonferrous Metals,2010,20(1):100-103.(in Chinese)
[4]黄俊.新型亚稳态β钛合金Ti-5Al-5V-5Mo-3Cr-0.5Fe循环变形机理及疲劳断裂性能研究[D].合肥:合肥工业大学,2011.HUANG Jun.The study on cyclic deformation mechanism and fatigue properties of new metastableβtitanium alloy[D].Hefei:Hefei University of Technology,2011.
[5]Panza-Giosa R,Wang Z,Embury D.A study of the microstructural and property in Ti-5Al-5Mo-5V-3Cr-0.5Feβ-titanium alloy[D].Tronoto:McMaster University&University of Tronoto,2009.
[6]Dehghan-Manshadi A,Dippenaar R J.Development ofα-phase morphologies during low temperature isothermal heat treatment of a Ti-5Al-5Mo-5V-3Cr alloy[J].Materials Science and Engineering A,2011,528(3):1833-1839.
[7]Nag S,Baberjee R,Hwang J Y,et al.ω-Assisted nucleation and growth of a precipitates in the Ti-5Al-5Mo-5V-3Cr-0.5Feβtitanium alloy[J].Acta Merialia,2009,57:2136-2147.
[8]Liu X Q,Tan C W,Zhang J,et al.Influence of microstructure and strain rate on adiabatic shearing behavior in Ti-6Al-4V alloys[J].Materials Science and Engineering A,2009,501:30-36.