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一種典型近α型鈦合金絕熱剪切帶組織特征研究
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1.西北工業(yè)大學(xué);2.西部超導(dǎo)材料科技股份有限公司;3.西北有色金屬研究院;4.西北工業(yè)大學(xué) 西部超導(dǎo)材料科技股份有限公司

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裝備預(yù)研沖擊環(huán)境材料技術(shù)重點(diǎn)實(shí)驗(yàn)室基金(61429020101)


Microstructure characteristics of adiabatic shear band in a typical near α-type Ti alloy
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1.Northwestern Polytechnical University;2.Western Superconducting Technologies Co,Ltd;3.Northwest Institute for Nonferrous Metal Research;4.Northwestern Polytechnical University Western Superconducting Technologies Co,Ltd

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    摘要:

    本文采用帽形試樣對(duì)一種典型近α型Ti-6Al-2Zr-1Mo-1V鈦合金在不同應(yīng)變率條件下的絕熱剪切特征開展了研究,結(jié)果表明：合金的動(dòng)態(tài)應(yīng)力應(yīng)變曲線呈現(xiàn)典型的三階段特征,分別對(duì)應(yīng)于應(yīng)變硬化、熱軟化和剪切局部化階段,最終形成絕熱剪切帶(ASB)。在近剪切帶處,初生α相和次生α相在過(guò)渡區(qū)內(nèi)發(fā)生扭曲變形,甚至斷裂,出現(xiàn)孿晶變形特征,近剪切帶區(qū)域微觀取向差增大,利于位錯(cuò)滑移/孿晶取向的α相優(yōu)先發(fā)生塑性變形,形成亞結(jié)構(gòu),晶粒碎化,發(fā)生動(dòng)態(tài)再結(jié)晶；隨著應(yīng)變率的提高,剪切帶寬度呈增大趨勢(shì),且出現(xiàn)旋渦結(jié)構(gòu)以協(xié)調(diào)和適應(yīng)變形；通過(guò)納米壓痕試驗(yàn),分析了ASB及其附近與基體α相、β相的彈性模量和顯微硬度,表明該合金的絕熱剪切帶為一條軟化帶,影響區(qū)的寬度在ASB附近30μm以內(nèi)。

    Abstract:

    The adiabatic shear characteristics of a typical near α-type Ti-6Al-2Zr-1Mo-1V Ti alloy at different strain rates have been investigated by hat shaped specimen. The results show that the dynamic stress-strain curve can be divided into three typical stages, which correspond to strain hardening, heat softening and shear localization, respectively, and finally develops into mature ASB；Close to the shear band，the primary α and second α distorted or even fractured in the transition zone，and showing the characteristics of twin deformation；In the near shear zone, the Kernel average misorientation(KAM) increases, α phase which is favorable to dislocation slip/twin orientation has a preferential plastic deformation, forming substructure, grain fragmentation and dynamic recrystallization. With the increase of strain rate, the width of shear band extended, and the vortex structure is supplemented by the coordination and adaptive deformation. The elastic modulus and microhardness of α-phase and β-phase of ASB ,near ASB and matrix were analyzed by nano indentation test, the results show that the adiabatic shear band of the this alloy is a softening band, and the width of the heat-affected zone is about 30μm around ASB.

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郝芳,杜予晅,毛友川,陳軍,辛社偉,陳海生,王凱旋,劉向宏,馮勇.一種典型近α型鈦合金絕熱剪切帶組織特征研究[J].稀有金屬材料與工程,2021,50(10):3664~3669.[Hao Fang, Du Yuxuan, Mao Youchua, Chen Jun, Xin Shewei, Chen Haisheng, Wang Kaixuan, Liu Xianghong, Feng Yong. Microstructure characteristics of adiabatic shear band in a typical near α-type Ti alloy[J]. Rare Metal Materials and Engineering,2021,50(10):3664~3669.]
DOI：10.12442/j. issn.1002-185X.20210653

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  • 收稿日期:2021-07-22
  • 最后修改日期:2021-08-14
  • 錄用日期:2021-08-26
  • 在線發(fā)布日期: 2021-10-28
  • 出版日期: 2021-10-25