定向再结晶对热轧态<strong>Cu71Al18Mn11</strong>合金的组织和超弹性性能的影响

doi:10.11901/1005.3093.2022.481

材料研究学报

2023, Vol. 37

Issue (8): 571-580 DOI: 10.11901/1005.3093.2022.481

研究论文

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定向再结晶对热轧态Cu71Al18Mn11合金的组织和超弹性性能的影响

徐利君¹^,², 郑策¹, 冯小辉¹, 黄秋燕¹(

), 李应举¹(

), 杨院生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

Effects of Directional Recrystallization on Microstructure and Superelastic Property of Hot-rolled Cu71Al18Mn11 Alloy

XU Lijun¹^,², ZHENG Ce¹, FENG Xiaohui¹, HUANG Qiuyan¹(

), LI Yingju¹(

), YANG Yuansheng¹

^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:

徐利君, 郑策, 冯小辉, 黄秋燕, 李应举, 杨院生. 定向再结晶对热轧态Cu71Al18Mn11合金的组织和超弹性性能的影响[J]. 材料研究学报, 2023, 37(8): 571-580.
Lijun XU, Ce ZHENG, Xiaohui FENG, Qiuyan HUANG, Yingju LI, Yuansheng YANG. Effects of Directional Recrystallization on Microstructure and Superelastic Property of Hot-rolled Cu71Al18Mn11 Alloy[J]. Chinese Journal of Materials Research, 2023, 37(8): 571-580.

全文: PDF(19213 KB) HTML

摘要:

对75%变形量热轧态Cu71Al18Mn11合金进行热区温度分别为800、850和900℃和抽拉速度分别为2、5和15 μm/s的正交定向再结晶实验，研究工艺参数对热轧态Cu71Al18Mn11合金的定向再结晶组织和超弹性性能的影响，并分析定向再结晶机理。结果表明：随着抽拉速度的提高，定向再结晶的效果呈现先增强后减弱的趋势。抽拉速度为2 μm/s时为粗大等轴晶中掺杂着少量柱状晶的组织，抽拉速度提高到5 μm/s时可获得大长径比柱状晶组织，但抽拉速度提高至15 μm/s时则定向再结晶组织为柱状晶与等轴晶混合组织。大长径比柱状晶组织的合金其超弹性性能较好，900℃-5 μm/s定向再结晶合金的应变量为12%时残余应变仅为1.1%，超弹性应变为9.05%。抽拉速度和热区温度影响定向再结晶过程中柱状晶吞并其前端一次再结晶晶粒的速度，从而影响定向再结晶组织；当热区移动的速度、柱状晶吞并前端一次再结晶晶粒的速度和柱状晶前端生成一次再结晶晶粒的速度三者达到平衡时柱状晶界面持续向前推进，最终生成大长径比的柱状晶组织。

关键词 ：金属材料, Cu-Al-Mn, 定向再结晶, 超弹性性能, 二次再结晶

Abstract：

According to an orthogonal experiment design, the directional recrystallization of hot-rolled Cu71Al18Mn11 alloy with deformation degree of 75% was carried out at 800, 850 and 900℃, by drawing speed of 2, 5 and 15 μm/s respectively. The effect of process parameters on the directional recrystallization microstructure and superelasticity of the hot-rolled Cu71Al18Mn11 alloy was assessed, meanwhile, the directional recrystallization mechanism was analyzed. The results show that the directional recrystallization effect may firstly increase and then decrease with the increase of drawing speed. When the drawing speed is 2 μm/s, a small number of columnar grains emerged within the coarse equiaxed grains. When the drawing speed increases to 5 μm/s, the microstructure of columnar grains with large aspect ratio can be obtained. However, when the drawing speed further increases to 15 μm/s, the directional recrystallization microstructure is a mixture of columnar grains and equiaxed grains. The superelastic properties are better of the directionally recrystallized alloys with columnar grains of large aspect ratio. After being subjected to an applied strain of 12%, the alloy directionally recrystallized at 900℃- 5 μm/s presents a residual strain of only 1.1%, while a superelastic strain of 9.05%. The drawing velocity and hot zone temperature can affect the speed, at which the columnar grains swallowed up the primary recrystallized grains ahead in the process of directional recrystallization, thus affecting the microstructure of directionally recrystallized alloy. Once, the three speeds, i.e. the hot zone movement, the columnar grains swallowing up the primary recrystallized grains ahead and the generation of new primary recrystallization grains, all are in equilibrium, the front boundary of the existing columnar grains will continues to move forward, which will eventually promote the formation of microstructure of columnar grains with large aspect ratio.

Key words： metallic materials Cu-Al-Mn directional recrystallization superelastic property secondary recrystallization

收稿日期: 2022-09-06

ZTFLH:

TG146.1

基金资助:国家重点研发计划(2018YFE0115800)

通讯作者: 李应举，研究员，yjli@imr.ac.cn，研究方向为先进材料凝固与制备技术;
黄秋燕，副研究员，qyhuang16b@imr.ac.cn，研究方向为轻合金的设计与制备

Corresponding author: LI Yingju, Tel: 13840520360, E-mail: yjli@imr.ac.cn;
HUANG Qiuyan, Tel: 18512416690, E-mail: qyhuang16b@imr.ac.cn

作者简介: 徐利君，女，1997年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2022.481 或 https://www.cjmr.org/CN/Y2023/V37/I8/571

图1 定向再结晶装置的示意图

图2 循环加载-卸载拉伸实验用样品的示意图

图3 在不同温度梯度条件下样品进入热区前的温度变化

图4 在不同温度梯度条件下热轧Cu71Al18Mn11合金定向再结晶样品的金相照片

图5 热轧工艺参数不同的Cu71Al18Mn11合金定向再结晶样品的金相照片

图6 抽拉速度为5 μm/s时不同热区温度定向再结晶样品柱状晶的尺寸

图7 不同工艺参数热轧Cu71Al18Mn11合金定向再结晶后的循环加载-卸载拉伸曲线

图8 不同工艺参数热轧Cu71Al18Mn11合金定向再结晶样品的残余应变(εr)和超弹性(εSE)应变曲线

图9 不同工艺参数定向再结晶样品的超弹性应变(εSE)与外加应变(εt-εθ)的关系

Drawing velocity /μm·s^-1	2			5			15
Annealling temperature/℃	800	850	900	800	850	900	800	850	900
ε $S E M A X$ / %	6.34	7.58	9.99	7.75	7.54	11.65	3.54	4.97	8.71
ε $r M A X$ / %	6.40	6.55	4.34	10.59	4.00	4.24	5.36	9.55	9.41

表1 不同参数定向再结晶样品的最大超弹性应变(εSEMAX)和对应的残余应变(εrMAX)

图10 热轧Cu71Al18Mn11合金抽拉速度为5 μm/s定向再结晶后的整体宏观组织

图11 抽拉速度为5 μm/s不同热区温度定向再结晶样品的柱状晶IPF图

图12 热轧Cu71Al18Mn11合金等温退火后的金相照片

图13 热轧Cu71Al18Mn11合金在700℃退火30 min后的IPF图、再结晶分数和晶界分布以及在750℃退火20 min后的IPF图和晶界分布

图14 定向再结晶过程中等轴晶和柱状晶生长的示意图

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