在室温和液氮温度<strong>Ti-Al-Fe</strong>合金的拉伸行为及其变形机理

doi:10.11901/1005.3093.2023.230

材料研究学报

2024, Vol. 38

Issue (3): 232-240 DOI: 10.11901/1005.3093.2023.230

研究论文

本期目录 | 过刊浏览

在室温和液氮温度Ti-Al-Fe合金的拉伸行为及其变形机理

尹艳超(

), 吕逸帆, 刘千里, 许亚利, 蒋鹏, 余巍

中国船舶集团有限公司第七二五研究所洛阳 471023

Tensile Behavior and Plastic Deformation Mechanism of Ti-Al-Fe Alloy at Room Temperature and Liquid Nitrogen Temperature

YIN Yanchao(

), LV Yifan, LIU Qianli, XU Yali, JIANG Peng, YU Wei

Luoyang Ship Material Research Institute, Luoyang 471023, China

引用本文:

尹艳超, 吕逸帆, 刘千里, 许亚利, 蒋鹏, 余巍. 在室温和液氮温度Ti-Al-Fe合金的拉伸行为及其变形机理[J]. 材料研究学报, 2024, 38(3): 232-240.
Yanchao YIN, Yifan LV, Qianli LIU, Yali XU, Peng JIANG, Wei YU. Tensile Behavior and Plastic Deformation Mechanism of Ti-Al-Fe Alloy at Room Temperature and Liquid Nitrogen Temperature[J]. Chinese Journal of Materials Research, 2024, 38(3): 232-240.

全文: PDF(22584 KB) HTML

摘要:

在室温(25℃)和液氮温度(-196℃)测试Ti-Al-Fe合金的拉伸性能，并使用扫描电镜(SEM)、透射电镜(TEM)和电子背散射衍射(EBSD) 表征和分析破断后试样的显微组织和断口形貌，研究了这种合金的拉伸行为及其变形机理。结果表明，Ti-Al-Fe合金在25℃拉伸塑性变形后，在其显微组织中极少发现孪晶，其塑性变形机制主要为位错滑移。在-196℃该合金的强度和塑性较好，表现出孪晶诱发塑性效应，在塑性变形过程中生成了大量孪晶，其类型为{11 $2 -$ 2}型压缩孪晶、{10 $1 -$ 2}型拉伸孪晶和{11 $2 -$ 4}型压缩孪晶，其塑性变形机制为滑移和孪生共存。在不同变形阶段孪晶的类型和数量不同，在变形初期孪晶的类型主要为{11 $2 -$ 2}型孪晶，在变形后期{10 $1 -$ 2}型孪晶的数量增多。

关键词 ：金属材料, Ti-Al-Fe合金, 拉伸性能, 塑性变形机制, 孪晶

Abstract：

The tensile properties of Ti-Al-Fe alloy were assessed at 25^oC and -196^oC respectively, aiming to understand the service performance and plastic deformation mechanism of the low-cost Ti-Al-Fe alloy at extreme low temperatures, so that to ensure the service safety of the relevant engineering structures. The microstructure and fracture surface of the alloy were characterized by scanning electron microscope, transmission electron microscope and electron backscatter diffraction technology. The results show that twinning is rarely found in the microstructure of the alloy after plastic deformation at 25^oC, and the plastic deformation mechanism is mainly dislocation slipping. Ti-Al-Fe alloy exhibits better strength and plasticity at 196^oC, with clear twinning induced plastic effect. A large number of twins are produced during plastic deformation, which include{11 $2 -$ 2} compression twins, {10 $1 -$ 2} tensile twins, {11 $2 -$ 4} compression twins. The plastic deformation mechanism may be ascribed to the coexistence of slipping and twinning. At the initial stage of deformation, {11 $2 -$ 2} twins are mainly found, and the number of {10 $1 -$ 2} twins increase at the later stage of deformation.

Key words： metallic materials Ti-Al-Fe alloy tensile property plastic deformation mechanism twinning

收稿日期: 2023-04-18

ZTFLH:

TG146.23

基金资助:国家自然科学基金(51701189)

通讯作者: 尹艳超，alvinyin@sina.cn，研究方向为钛合金材料及其结构

Corresponding author: YIN Yanchao, Tel:(0379)64829315, E-mail: alvinyin@sina.cn

作者简介: 尹艳超，男，1989年生，本科

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.230 或 https://www.cjmr.org/CN/Y2024/V38/I3/232

表1 Ti-Al-Fe合金的化学成分

图1 Ti-Al-Fe合金的显微组织

表2 原始态和退火态Ti-Al-Fe合金的拉伸力学性能

图2 退火态Ti-Al-Fe合金拉伸试样在不同温度下的断口宏观形貌

图3 退火态Ti-Al-Fe合金在不同温度下拉伸试样断口的微观形貌

图4 在-196℃拉伸不同变形量后退火态Ti-Al-Fe合金的显微组织

图5 局部区域孪晶的形貌和取向

图6 在-196℃拉伸不同变形量后退火态Ti-Al-Fe合金的晶粒取向差百分比

图7 在25℃退火态Ti-Al-Fe合金拉伸塑性变形区域的TEM照片

图8 在-196℃退火态Ti-Al-Fe合金拉伸塑性变形区域的TEM照片

图 9 退火态Ti-Al-Fe合金棒材的EBSD测试结果

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