粉末Ti-22Al-24Nb-0.5Mo合金热变形能力的对比研究<sup>*</sup>

doi:10.11901/1005.3093.2015.150

材料研究学报

2015, Vol. 29

Issue (6): 445-452 DOI: 10.11901/1005.3093.2015.150

本期目录 | 过刊浏览

粉末Ti-22Al-24Nb-0.5Mo合金热变形能力的对比研究^*

卢正冠,吴杰,徐磊(

),卢斌,雷家峰,杨锐

中国科学院金属研究所沈阳 110016

Comparative Study on Hot Workability of Powder Metallurgy Ti-22Al-24Nb-0.5Mo Alloy

Zhengguan LU,Jie WU,Lei XU(

),Bin LU,Jiafeng LEI,Rui YANG

Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

卢正冠,吴杰,徐磊,卢斌,雷家峰,杨锐. 粉末Ti-22Al-24Nb-0.5Mo合金热变形能力的对比研究^*[J]. 材料研究学报, 2015, 29(6): 445-452.
Zhengguan LU, Jie WU, Lei XU, Bin LU, Jiafeng LEI, Rui YANG. Comparative Study on Hot Workability of Powder Metallurgy Ti-22Al-24Nb-0.5Mo Alloy[J]. Chinese Journal of Materials Research, 2015, 29(6): 445-452.

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摘要:

采用预合金粉末热等静压工艺制备名义成分为Ti-22Al-24Nb-0.5Mo(原子百分数)的粉末Ti₂AlNb合金, 对粉末合金、经热处理的粉末合金和同种成分的熔铸Ti₂AlNb合金进行了压缩实验。结果表明, 粉末Ti₂AlNb合金具有与熔铸变形合金相当的变形能力, 热处理对粉末Ti₂AlNb合金的变形能力没有明显的影响, 粉末合金在低温和高应变速率下的变形抗力更低, 不易开裂。采用典型粉末成型工艺制备粉末Ti₂AlNb热变形坯料, 在两相区进行了不同变形量的墩粗和拔长热变形。结果表明, 粉末Ti₂AlNb坯料变形后没有宏观裂纹, 变形均匀。拉伸实验结果表明, 变形后经热处理的粉末Ti₂AlNb合金表现出更好的拉伸性能。

关键词 ：金属材料, Ti₂AlNb合金, 粉末冶金, 热等静压, 热机械加工

Abstract：

Powder metallurgy (PM) Ti₂AlNb alloy of Ti-22Al-24Nb-0.5Mo (atomic fraction, %) was prepared from pre-alloyed powder using hot isostatic pressing (HIPing). Compression tests of PM Ti₂AlNb alloy, heat treated PM Ti₂AlNb alloy and wrought Ti₂AlNb alloy with the same chemical composition were conducted on Gleeble-3800 testing machine. The testing temperatures were from 930^oC to 1050^oC, strain rates varied from 0.001 s^-1 to 10 s^-1, and engineering strain was about 50% for each compression. The results show that the deformability of PM Ti₂AlNb alloy is comparable to that of wrought alloy, and heat treatment has no obvious effect on the hot workability of PM Ti₂AlNb alloy. The high temperature flow behavior of Ti₂AlNb alloys prepared by different fabrication routes is similar in this work, while processing windows for PM Ti₂AlNb alloy is broader than casting alloys especially at low temperature or relative high strain rate. PM Ti₂AlNb billets for hot deformation were prepared by a typical powder metallurgy process, and were upset or drawn out to different deformation in two-phase region. Macrostructure of deformed PM Ti₂AlNb billets were observed, no macro crack was found in deformed PM Ti₂AlNb billets and the deformation was uniform. The results of tensile tests show that the deformed PM Ti₂AlNb alloy after heat treatment presents better tensile properties.

Key words： metallic materials Ti₂AlNb alloys powder metallurgy hot isostatic pressing thermal mechanical processing

收稿日期: 2015-03-23

基金资助:^*国家高技术研究发展计划2013AA031606资助项目。

作者简介: 徐磊

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表1 Ti2AlNb预合金粉末和合金坯料的化学成分

表2 三种Ti2AlNb合金及制备方法

图1 三种状态样品的显微组织

图2 έ=0.1 s-1下三种状态Ti2AlNb不同温度下的应力应变曲线

图3 在έ=0.1s-1, T=1005, 1030oC条件下三种状态Ti2AlNb合金的应力应变曲线比较

表3 不同变形条件下三种状态Ti2AlNb的峰值应力

图4 在έ=0.1 s-1, T=830oC条件下三种状态Ti2AlNb合金样品压缩后的宏观形貌

图5 热等静压态和变形态Ti2AlNb合金的峰值应力和温度的关系

图6 热等静压态和变形态Ti2AlNb合金的应变速率和峰值应力的关系

表4 几种不同状态Ti2AlNb合金的热激活能

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