不同温度轧制<strong>Al-Zn-Mg-Cu</strong>合金再结晶后的<strong>{111}/{111}</strong>近奇异晶界

doi:10.11900/0412.1961.2022.00027

金属学报

2023, Vol. 59

Issue (7): 947-960 DOI: 10.11900/0412.1961.2022.00027

研究论文

本期目录 | 过刊浏览

不同温度轧制Al-Zn-Mg-Cu合金再结晶后的{111}/{111}近奇异晶界

王宗谱¹, 王卫国¹^,²(

), Rohrer Gregory S³, 陈松¹^,², 洪丽华¹^,², 林燕¹^,², 冯小铮¹, 任帅¹, 周邦新⁴

¹福建工程学院晶界工程研究所福州 350118
²福建工程学院材料科学与工程学院福州 350118
³Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA15213 -3890, USA
⁴上海大学材料研究所上海 200072

{111}/{111} Near Singular Boundaries in an Al-Zn-Mg-Cu Alloy Recrystallized After Rolling at Different Temperatures

WANG Zongpu¹, WANG Weiguo¹^,²(

), Rohrer Gregory S³, CHEN Song¹^,², HONG Lihua¹^,², LIN Yan¹^,², FENG Xiaozheng¹, REN Shuai¹, ZHOU Bangxin⁴

¹Institute of Grain Boundary Engineering, Fujian University of Technology, Fuzhou 350118, China
²School of Materials Science and Technology, Fujian University of Technology, Fuzhou 350118, China
³Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA15213 -3890, USA
⁴Institute of Materials, Shanghai University, Shanghai 200072, China

引用本文:

王宗谱, 王卫国, Rohrer Gregory S, 陈松, 洪丽华, 林燕, 冯小铮, 任帅, 周邦新. 不同温度轧制Al-Zn-Mg-Cu合金再结晶后的{111}/{111}近奇异晶界[J]. 金属学报, 2023, 59(7): 947-960.
Zongpu WANG, Weiguo WANG, Gregory S Rohrer, Song CHEN, Lihua HONG, Yan LIN, Xiaozheng FENG, Shuai REN, Bangxin ZHOU. {111}/{111} Near Singular Boundaries in an Al-Zn-Mg-Cu Alloy Recrystallized After Rolling at Different Temperatures[J]. Acta Metall Sin, 2023, 59(7): 947-960.

全文: PDF(6204 KB) HTML

摘要:

经470~520℃双级固溶处理的国产Al-Zn-Mg-Cu (7A85) 合金分别在250、300、350、400和450℃施行厚度减缩量为80%的轧制变形后，立即经520℃、30 min完成再结晶退火处理。采用基于电子背散射衍射和五参数分析的晶界界面匹配表征方法对上述试样进行测试和分析发现，轧制温度对后续再结晶退火{111}/{111}近奇异晶界的形成有显著影响，表现为{111}/{111}近奇异晶界比例随轧制温度的升高呈现先上升、然后下降至一定值并保持基本恒定的变化规律；经300℃轧制及后续再结晶退火，{111}/{111}近奇异晶界比例达到极大值5.0%，是奇异晶界(共格孪晶界)比例的近10倍。对试样显微组织进行观察和分析表明，经300℃轧制，样品中形成特定变形亚结构，并且具备一定形变储能，在后续再结晶退火过程中，其组织演化以连续再结晶为主，有利于{111}/{111}近奇异晶界的形成。相反，经350℃及以上温度轧制，试样发生了不连续动态再结晶，不利于后续退火{111}/{111}近奇异晶界的形成；经250℃轧制，试样内存在较高储能，在后续退火过程中发生了不连续再结晶，也不利于{111}/{111}近奇异晶界的形成。离线原位表面侵蚀实验和高分辨透射电子显微镜观察表明，{111}/{111}近奇异晶界的腐蚀抗力显著高于一般晶界，此类晶界具有旋错结构特征，其结构有序度显著高于一般晶界。

关键词 ： Al-Zn-Mg-Cu合金, 超高强铝合金, 近奇异晶界, 晶界界面匹配, 晶界腐蚀

Abstract：

Recent development in grain boundary design and control indicates that manipulating the {111}/{111} near singular boundaries will be a promising pertinent to improve the performance against intergranular corrosion attacks for the high stacking fault energy face-centered cubic metals such as aluminum and its alloys. In the current study, five samples of a home-made Al-Zn-Mg-Cu super-high-strength aluminum alloy were rolled at temperatures of 250, 300, 350, 400, and 450^oC, followed by 30 min annealing at 520^oC. A method of grain boundary interconnection characterization based on electron backscatter diffraction and five parameter analysis was utilized to assess the {111}/{111} near singular boundaries in the samples as processed. The preceding rolling temperature was discovered to have a significant impact on the formation of {111}/{111} near singular boundaries during the subsequent annealing at 520^oC, that is, the fraction of {111}/{111} near singular boundaries out of the entire grain boundaries increases at first and then decreases as the preceding rolling temperature increases from 250^oC to 450^oC. In the five samples as processed, the one rolled at 300^oC followed by annealing at 520^oC has a peak content of {111}/{111} near singular boundaries and the fraction reaches 5.0%, which is 10 times higher compared to that of the singular boundaries or namely the coherent twin boundaries. Further investigations reveal that the sample rolled at 300^oC possesses a specific deformation substructure as well as suitable stored energy, resulting in continuous recrystallization during the successive annealing. This type of behavior aids in the formation of {111}/{111} near singular boundaries. The samples rolled at or above 350^oC, on the other hand, exhibit discontinuous dynamic recrystallization, which is detrimental to the development of {111}/{111} near singular boundaries during subsequent annealing. Compared to the sample rolled at 300^oC, the sample rolled at 250^oC has higher stored energy and it improves discontinuous recrystallization during the subsequent annealing. This also harms the formation of {111}/{111} near singular boundaries. Off-line in-situ surface etching test and high-resolution transmission electron microscope (HR-TEM) observation demonstrate that the {111}/{111} near singular boundaries have much higher resistance to intergranular corrosion in comparison to the random boundaries, they possess disclination structures of which the atomic ordering is much higher than that of the random boundaries. The results show that the {111}/{111} near singular boundary is regulable, and to further improving the fraction of such boundaries by manipulating the microstructure evolution will be effective in the practice of how reducing the intergranular corrosion in the aluminum and its alloys.

Key words： Al-Zn-Mg-Cu alloy super-high strength aluminum alloy near singular boundary grain boundary inter-connection intergranular corrosion

收稿日期: 2022-01-21

ZTFLH:

TG113

基金资助:国家自然科学基金项目(51971063);中央引导地方科技发展专项项目(2019L3010)

通讯作者: 王卫国，wang_weiguo@vip.163.com，主要从事金属和无机非金属材料晶界工程研究

Corresponding author: WANG Weiguo, professor, Tel: (0591)22863515, E-mail: wang_weiguo@vip.163.com

作者简介: 王宗谱，男，1996年生，硕士生

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	王宗谱
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	周邦新
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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00027 或 https://www.ams.org.cn/CN/Y2023/V59/I7/947

表1 Al-Zn-Mg-Cu 合金样品编号及其加工状态

图1 样品A~E的取向成像显微(OIM)像、晶界网络(GBN)图和晶界取向差分布(MD)

表2 样品A~E经轴过滤获得的取向差转轴为<111>、<112>和<122>的晶界数量及其比例统计

图2 样品A~E的固定转轴晶界取向差分布

图3 样品A不同取向差{111}/{111}近奇异晶界(NSB)的五参数晶界面分布图(投影在(001)内)

图4 样品B不同取向差{111}/{111}-NSB的五参数晶界面分布图(投影在(001)内)

图5 样品C不同取向差{111}/{111}-NSB的五参数晶界面分布图(投影在(001)内)

表3 样品A~E的{111}/{111}-NSB比例定量计算

图6 样品A~E的{111}/{111}-NSB和奇异晶界(SB)比例

图7 样品A~C的Σ3 (<111>/60°)晶界的五参数晶界面分布图(投影在(001)内)

图8 Al-Zn-Mg-Cu合金包含{111}/{111}-NSB微区OIM像、{111}/{111}-NSB的{111}重叠极图晶界迹线分析和{111}/{111}-NSB离线原位表面侵蚀形貌特征

图9 Al-Zn-Mg-Cu合金{111}/{111}-NBS的HRTEM像和SAED花样

图10 样品A1~C1的OIM像

图11 样品A1~C1的取向差分布

图12 样品A1~E1的Vickers硬度

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