短程有序对高层错能<strong>Cu-Mn</strong>合金拉<strong>-</strong>拉疲劳变形行为及损伤机制的影响

doi:10.11900/0412.1961.2021.00082

金属学报

2022, Vol. 58

Issue (9): 1208-1220 DOI: 10.11900/0412.1961.2021.00082

研究论文

本期目录 | 过刊浏览

短程有序对高层错能Cu-Mn合金拉-拉疲劳变形行为及损伤机制的影响

韩冬¹, 张炎杰¹, 李小武¹^,²(

)

^1.东北大学材料科学与工程学院材料物理与化学系沈阳 110819
^2.东北大学材料各向异性与织构教育部重点实验室沈阳 110819

Effect of Short-Range Ordering on the Tension-Tension Fatigue Deformation Behavior and Damage Mechanisms of Cu-Mn Alloys with High Stacking Fault Energies

HAN Dong¹, ZHANG Yanjie¹, LI Xiaowu¹^,²(

)

^1.Department of Materials Physics and Chemistry, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
^2.Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China

引用本文:

韩冬, 张炎杰, 李小武. 短程有序对高层错能Cu-Mn合金拉-拉疲劳变形行为及损伤机制的影响[J]. 金属学报, 2022, 58(9): 1208-1220.
Dong HAN, Yanjie ZHANG, Xiaowu LI. Effect of Short-Range Ordering on the Tension-Tension Fatigue Deformation Behavior and Damage Mechanisms of Cu-Mn Alloys with High Stacking Fault Energies[J]. Acta Metall Sin, 2022, 58(9): 1208-1220.

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摘要:

以不同Mn含量的高层错能Cu-Mn合金为研究对象,在恒应力幅控制下系统研究了短程有序对其拉-拉疲劳变形行为及损伤机制影响的规律和微观机理。结果表明,随着短程有序度的增加,微观变形机制由位错的波状滑移逐渐转变为平面滑移,疲劳裂纹萌生模式由倾向沿晶开裂转变为沿滑移带开裂,合金的拉-拉疲劳寿命显著提高。上述影响在宏观上表现为Basquin关系中疲劳强度系数( $σ^{'}_{f}$ )和疲劳强度指数(b)的同步增大。分析表明, $σ^{'}_{f}$ 的增大主要归因于Mn元素的固溶强化和位错平面滑移所引起的加工硬化能力的增强；而b的增大则源于位错平面滑移表现出的更高的变形均匀性和滑移可逆性。

关键词 ： Cu-Mn合金, 短程有序, 层错能, 疲劳, 位错滑移方式, 位错结构

Abstract：

The cyclic-deformation mechanism of face-centered cubic (fcc) pure metals or single-phase alloys, i.e., decreasing the stacking fault energy (SFE) of materials through alloying could lead to the transition of dislocation slip mode from wavy slip to planar slip, thereby, improving fatigue properties has been achieved after extensive research. However, except for diminishing SFE, alloying treatment can increase the degree of short-range ordering (SRO) in the alloy, which could equally promote the activation of planar slip just as the lower SFE does in alloys. However, most studies only emphasized the unilateral effect of SFE but ignored the action of SRO. For some single-phase fcc alloys, such as Cu-Mn, Cu-Ni, and some high-entropy alloys, the effect of SRO cannot be ignored. Therefore, in this study, the high SFE Cu-Mn alloys with different SRO degrees were selected as the target materials and general rules and micromechanisms for the effect of SRO on their tension-tension fatigue deformation and damage behavior were investigated under different stress amplitudes. The results show that with the increase of SRO degree, the dislocation slip mode changes from wavy to planar slip. Fatigue-cracking mode changes from dominating intergranular cracking to slip-band cracking, and the tension-tension fatigue life of Cu-Mn alloys is improved. The abovementioned effects are manifested as a synchronous improvement of fatigue strength coefficient ( $σ^{'}_{f}$ ) and fatigue strength exponent (b) in the Basquin relation. The analysis shows that the enlargement of $σ^{'}_{f}$ is mainly owing to the solid solution strengthening of Mn element, and the planar-slip enhanced work-hardening capacity, whereas the increase in b stems from the higher deformation uniformity and slip reversibility governed by planar slip. In summary, this study provides guide for improving the fatigue properties of fcc metals.

Key words： Cu-Mn alloy short-range ordering stacking fault energy fatigue dislocation slip mode dislocation structure

收稿日期: 2021-02-26

ZTFLH:

TG111.8

基金资助:国家自然科学基金项目(51571058);国家自然科学基金项目(51871048)

作者简介: 韩冬,男,满族,1985年生,博士生

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表1 拉-拉疲劳测试中Cu-Mn 合金选取的应力幅

图1 Cu-Mn合金显微组织的OM像

图2 Cu-Mn合金的XRD谱

表2 不同Mn含量Cu-Mn合金的室温力学性能[16]

图3 Cu-Mn合金的应力幅-疲劳寿命(S-N)曲线

图4 Cu-Mn合金的疲劳强度系数(σf')与拉伸力学性能之间的关系

图5 Cu-Mn合金在应力幅为90 MPa下表面变形形貌和损伤特征的SEM像

图6 Cu-15%Mn和Cu-20%Mn合金在应力幅为115 MPa下表面损伤特征的SEM像

图7 应力幅对Cu-20%Mn合金拉-拉疲劳损伤开裂行为的影响

图8 低应力幅(90 MPa)下Cu-Mn合金疲劳后样品内部微观结构的TEM像

图9 中等应力幅(115 MPa)下Cu-Mn合金疲劳后样品内部微观结构的TEM像

图10 高应力幅(130 MPa)下Cu-Mn合金疲劳后样品内部微观结构的TEM像

图11 双对数坐标下S-N曲线示意图

图12 几种典型fcc结构金属的σf'和拉伸强度之间的关系[20,34,36~38]

图13 滑移方式对Cu-Mn合金晶间变形均匀性影响的示意图

图14 应力幅90 MPa下Cu-Mn合金疲劳后裂纹源区形貌的SEM像

图15 短程有序对Cu-Mn合金拉-拉疲劳性能及变形微观结构影响的示意图

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