<strong>Ti65</strong>钛合金的超塑变形和微观组织演变

doi:10.11901/1005.3093.2024.319

材料研究学报

2025, Vol. 39

Issue (7): 489-498 DOI: 10.11901/1005.3093.2024.319

研究论文

本期目录 | 过刊浏览

Ti65钛合金的超塑变形和微观组织演变

张宁¹^,²^,³(

), 王耀奇¹^,²^,³, 杨毅⁴, 慕延宏¹^,²^,³, 李震¹^,²^,³, 陈志勇⁵

^1.中国航空制造技术研究院北京 100024
^2.塑性成形技术航空科技重点实验室北京 100024
^3.数字化塑性成形技术及装备北京市重点实验室北京 100024
^4.陕西飞机工业有限责任公司汉中 710048
^5.中国科学院金属研究所沈阳 110016

Superplastical Deformation Behavior and Microstructure Evolution of Ti65 Ti-alloy

ZHANG Ning¹^,²^,³(

), WANG Yaoqi¹^,²^,³, YANG Yi⁴, MU Yanhong¹^,²^,³, LI Zhen¹^,²^,³, CHEN Zhiyong⁵

^1.AVIC Manufacturing Technology Institute, Beijing 100024, China
^2.Aeronautical Key Laboratory for Plastic Forming Technology, Beijing 100024, China
^3.Beijing Key Laboratory of Digital Forming Technology and Equipment, Beijing 100024, China
^4.Shanxi Aircraft Industry Co., Ltd., Hanzhong 710048, China
^5.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

张宁, 王耀奇, 杨毅, 慕延宏, 李震, 陈志勇. Ti65钛合金的超塑变形和微观组织演变[J]. 材料研究学报, 2025, 39(7): 489-498.
Ning ZHANG, Yaoqi WANG, Yi YANG, Yanhong MU, Zhen LI, Zhiyong CHEN. Superplastical Deformation Behavior and Microstructure Evolution of Ti65 Ti-alloy[J]. Chinese Journal of Materials Research, 2025, 39(7): 489-498.

全文: PDF(19636 KB) HTML

摘要:

在900~960 ℃，0.001~0.03 s^-1条件下进行Ti65高温钛合金的高温超塑性拉伸实验，研究其超塑性变形行为并揭示了变形温度和应变速率对其超塑性能的影响；计算了Ti65钛合金超塑变形的应变速率敏感性指数m、应力指数n和变形激活能Q，揭示了Ti65钛合金的超塑变形机制；用电子背散射技术(EBSD)表征了Ti65钛合金超塑拉伸试样断口附近的晶粒尺寸、晶粒取向和分布规律，揭示了变形温度和应变速率对材料超塑变形过程中微观组织演变的影响规律。结果表明，随着变形温度的提高Ti65钛合金的流动应力逐渐减小，伸长率逐渐提高；降低应变速率则其流动应力随之减小，而伸长率先提高后降低；在变形温度为960 ℃、应变速率为0.003 s^-1的条件下Ti65钛合金的伸长率达到最大值1108%，其超塑性能最佳；Ti65钛合金的应变速率敏感性指数m值为0.42、应力指数n值为2.5、超塑变形激活能Q为393 kJ/mol，表明其超塑性变形机制以晶界滑动和位错滑移为主；在不同条件下的超塑变形过程中Ti65钛合金均发生显著的动态再结晶，生成了均匀分布的细小等轴晶粒，且随着变形温度的提高和应变速率的减小不连续动态再结晶的程度提高；Ti65钛合金的晶粒尺寸随着变形温度的提高而增大，随着应变速率的提高先增大后减小。

关键词 ：金属材料, Ti65钛合金, 超塑变形, 变形行为, 微观组织演变, 动态再结晶

Abstract：

The superplastic deformation behavior of Ti65 Ti-alloy was studied via tensile testing in temperature range of 900~960 ^oC at strain rate range of 0.001~0.03 s^-1 in terms of the effect of temperature and strain rate on the superplastic properties of the alloy. Meanwhile, the strain rate sensitivity index m, stress index n and deformation activation energy Q of the alloy were acquired. The grain size, grain orientation and distribution in the area nearby the tensile fracture of the test alloy were characterized by electron back-scattered diffraction (EBSD) technique. The results show that with the increase of temperature the flow stress of Ti65 Ti-alloy is reduced and the elongation is elevated. With the reducing strain rate, the flow stress decreases, and the elongation first increases and then decreases. At the deformation temperature of 960 ^oC and strain rate of 0.003 s^-1, the maximum elongation of the alloy reached 1108%, namely its superplasticity is the best. Correspondingly, the strain rate sensitivity index m is 0.42, the stress index n is 2.5, and the superplastic deformation activation energy Q is 393 kJ/mol, which illuminated that the predominate deformation mechanism is grain boundary sliding and dislocation sliding for Ti65 Ti-alloy. During the superplastic deformation process under different conditions, the Ti65 Ti-alloy undergoes significant dynamic recrystallization, generating uniformly distributed fine equiaxed grains. As the deformation temperature rising and the strain rate reducing, the degree of discontinuous dynamic recrystallization enhances. The grain size of Ti65 Ti-alloy increases with the increase of deformation temperature, and while increases first and then decreases with the increase of strain rate.

Key words： metallic materials Ti65 titanium alloy superplasticity deformation behavior microstructure evolution dynamic recrystallization

收稿日期: 2024-07-24

ZTFLH:

TG132

基金资助:航空科学基金(2022Z047025001)

通讯作者: 张宁，高级工程师，zn64112@163.com，研究方向为耐高温金属材料塑性成形技术

Corresponding author: ZHANG Ning, Tel: 13811524062, E-mail: zn64112@163.com

作者简介: 张宁，女，1985年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2024.319 或 https://www.cjmr.org/CN/Y2025/V39/I7/489

表1 Ti65钛合金主要化学成分

图1 Ti65钛合金板材的微观组织

图2 超塑性拉伸试样的尺寸

图3 在不同变形条件下拉伸后试样的宏观形貌

图4 在不同变形条件下Ti65钛合金超塑拉伸应力-应变曲线

图5 变形温度对Ti65合金峰值应力和伸长率的影响

图6 应变速率对Ti65合金峰值应力和伸长率的影响

图7 lnσ-lnε˙关系曲线

图8 lnσ-1/T曲线

图9 在不同变形温度下Ti65钛合金晶粒的形貌

图10 在不同变形温度下Ti65钛合金的取向分布

图11 平均晶粒尺寸与变形温度的关系

图12 应变速率不同的Ti65钛合金的晶粒形貌

图13 应变速率不同的Ti65钛合金的取向分布

图14 平均晶粒尺寸与应变速率的关系

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