<strong>Ti65</strong>合金的初级蠕变和稳态蠕变

doi:10.11901/1005.3093.2019.286

材料研究学报

2020, Vol. 34

Issue (2): 151-160 DOI: 10.11901/1005.3093.2019.286

研究论文

本期目录 | 过刊浏览

Ti65合金的初级蠕变和稳态蠕变

岳颗^1,²,刘建荣¹(

),杨锐¹,王清江¹

1. 中国科学院金属研究所沈阳 110016
2. 中国科学技术大学材料科学与工程学院沈阳 110016

Primary Creep and Steady-State Creep of Ti65 Alloy

YUE Ke^1,²,LIU Jianrong¹(

),YANG Rui¹,WANG Qingjiang¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

岳颗, 刘建荣, 杨锐, 王清江. Ti65合金的初级蠕变和稳态蠕变[J]. 材料研究学报, 2020, 34(2): 151-160.
YUE Ke, LIU Jianrong, YANG Rui, WANG Qingjiang. Primary Creep and Steady-State Creep of Ti65 Alloy[J]. Chinese Journal of Materials Research, 2020, 34(2): 151-160.

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摘要:

使用透射电镜(TEM)研究了Ti65合金在600~650℃、120~160 MPa条件下的蠕变变形行为及其微观变形机制。结果表明：初级蠕变变形机制主要由受攀移控制的位错越过α₂相的过程主导；稳态蠕变阶段蠕变机制主要由受界面处扩散控制的位错攀移的过程主导，且应力指数为5~7。在初级蠕变阶段α₂相与位错的相互作用是α₂相对合金高温强化的主要方式，在稳态蠕变阶段沿α/β相界分布的硅化物阻碍位错运动与限制晶界滑移是硅化物对合金强化的主要方式。

关键词 ：材料科学基础学科, 蠕变机制, 蠕变试验, Ti65合金

Abstract：

The creep deformation behavior and relevant microscopic deformation mechanisms of Ti65 alloy were investigated via tensile creep test by stresses in the range of 120~160 MPa at 600~650^oC and TEM observation. The results show that the primary creep deformation mechanism is dominated by the process of climbing-controlled dislocations crossing the α₂ phases and the creep mechanism in the steady-state creep stage is dominated by the process of diffusion-controlled dislocation climbing at the α/β interfaces, and the stress index of steady-state creep stage varies from 5 to 7. The hindering of dislocation motions by α₂ phases is the dominating process to strengthen the high-temperature creep resistance of Ti65 alloy during the primary creep stage. The silicide precipitates distributed along α/β phase boundaries, impede the dislocation motions and restrict the grain boundary slip (GBS), which is the dominating strengthening mechanism during the steady-state creep stage.

Key words： microstructure and properties of materials creep deformation creep test Ti65 alloy

收稿日期: 2019-06-03

ZTFLH:

TG142.25

作者简介: 岳颗，男，1990年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.286 或 https://www.cjmr.org/CN/Y2020/V34/I2/151

图1 Ti65合金试样蠕变前的组织

图2 蠕变试样的尺寸示意图

图3 典型的蠕变应变-时间曲线

图4 Ti65合金在不同应力条件下的蠕变应变-时间曲线

表1 不同条件下蠕变曲线的数值拟合结果(蠕变I和II阶段)

表2 不同蠕变条件下蠕变应变与稳态蠕变速率的统计

图5 稳态蠕变速率、蠕变应变及稳态蠕变阶段开始时间随温度应力的变化

图6 补偿稳态蠕变速率与归一化应力的关系

图7 蠕变后组织形貌的TEM明场像

图8 不同实验条件下蠕变试样中的位错组态

图9 Ti65合金650℃/160 MPa条件下蠕变后位错组态

图10 TEM观察不同蠕变条件下硅化物对位错的钉扎作用

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