0.2% H对Ti<sub>2</sub>AlNb基合金板材高温拉伸变形行为的影响<sup>*</sup>

doi:10.11901/1005.3093.2013.975

材料研究学报

2014, Vol. 28

Issue (4): 248-254 DOI: 10.11901/1005.3093.2013.975

本期目录 | 过刊浏览

0.2% H对Ti₂AlNb基合金板材高温拉伸变形行为的影响^*

宗影影,温道胜,邵斌,单德彬(

)

哈尔滨工业大学材料科学与工程学院金属精密热加工国家重点实验室哈尔滨 150001

Effect of 0.2% H on High Temperature Tensile Deformation Behavior of Ti₂AlNb Based Alloy Plate

Yingying ZONG,Daosheng WEN,Bin SHAO,Debin SHAN(

)

National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001

引用本文:

宗影影,温道胜,邵斌,单德彬. 0.2% H对Ti₂AlNb基合金板材高温拉伸变形行为的影响^*[J]. 材料研究学报, 2014, 28(4): 248-254.
Yingying ZONG, Daosheng WEN, Bin SHAO, Debin SHAN. Effect of 0.2% H on High Temperature Tensile Deformation Behavior of Ti₂AlNb Based Alloy Plate[J]. Chinese Journal of Materials Research, 2014, 28(4): 248-254.

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摘要:

为研究热氢处理技术对Ti₂AlNb基合金板材高温拉伸变形行为的影响, 在实验温度为870、900、930和990℃, 应变速率为2.5×10^-2 s^-1条件下,对H含量为0%和0.2%(质量分数)的Ti-22Al-25Nb合金板材进行了高温拉伸实验, 并对其微观组织进行了分析。结果表明: 0.2% H可以降低合金板材的高温流动应力, 提高延伸率。在930℃变形时, 置氢合金的峰值应力比未置氢合金下降了约36%, 延伸率比未置氢合金提高了约53%。氢致合金软化和增塑的主要机制是H促进了α₂相的动态再结晶, 促进了b/B2相的位错运动和动态回复, 提高了b/B2相的含量。

关键词 ：金属材料, 有色金属及其合金, Ti₂AlNb基合金, 热氢处理, 流动软化, 动态再结晶, 位错运动

Abstract：

In order to understand the effect of thermo hydrogen treatment (THT) on high temperature tensile behavior of a Ti₂AlNb based alloy plate, high temperature tensile tests of Ti-22Al-25Nb alloy plates without and with 0.2%H (mass fraction) charging were conducted with strain rate of 2.5×10^-2 s^-1 at 870, 900, 930 and 990℃respectively. It was found that 0.2%H charging could reduce the high temperature flow stress and enhance the tensile elongation. When deformed at 930℃, the peak stress of the hydrogen charged Ti-22Al-25Nb alloy decreased by approximately 36%, and the elongation increased by approximately 53% in comparison with the bare alloy. Hydrogen-induced softening and plasticity might mainly be attributed to the hydrogen promoted the dynamic recrystallization of α₂ phase, the dislocation movement and the dynamic recovery of b/B2 phase as well as increased the amount of b/B2 phase.

Key words： metallic materials nonferrous metals and alloy Ti₂AlNb based alloy thermo hydrogen technology flow softening dynamic recrystallization dislocation movement

收稿日期: 2013-12-27

基金资助:* 国家自然科学基金面上项目51275132, 材料成形与模具技术国家重点实验室开放基金资助项目2011-P11, 哈尔滨市科技创新人才研究基金 2008RFQXG046 资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.975 或 https://www.cjmr.org/CN/Y2014/V28/I4/248

图1 未置氢与置氢Ti-22Al-25Nb合金的XRD谱

图2 拉伸前未置氢与置氢Ti-22Al-25Nb合金的显微组织

表1 图2a中I、II、III 三个区域的元素含量

图3 未置氢与置氢Ti-22Al-25Nb合金的高温拉伸真应力-真应变曲线、峰值应力和延伸率曲线

图4 置氢Ti-22Al-25Nb合金在870℃, 2.5×10-2 s-1变形条件下的显微组织

图5 未置氢与置氢Ti-22Al-25Nb合金在930℃, 2.5×10-2 s-1变形条件下的显微组织

图6 未置氢与置氢Ti-22Al-25Nb合金在990℃, 2.5×10-2 s-1变形条件下的显微组织

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