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两种取向镍基单晶高温合金拉伸变形行为原位研究

任潇一，吕俊霞，周建力，程晓鹏，刘显强，王 晋，张跃飞*，张 泽
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2023年 第42卷 第2期: 1000-6281（2023）02-129-08     下载地址：

两种取向镍基单晶高温合金拉伸变形行为原位研究

任潇一，吕俊霞，周建力，程晓鹏，刘显强，王  晋，张跃飞*，张  泽

( 1.北京工业大学 材料与制造学部，北京 100124;2.浙江大学 材料科学与工程学院，浙江 杭州 310027)

摘  要  本文基于课题组开发的原位拉伸测试系统，结合扫描电镜(SEM)与数字图像相关方法(DIC)，研究了[001] 和[314]取向的二代镍基单晶高温合金在室温下的拉伸变形断裂行为和微观结构演变之间的关系。结果显示，镍基单晶高温合金的力学性能具有各向异性。室温下镍基单晶高温合金的拉伸变形主要以滑移带剪切γ′相为主，其中[001]取向试样开启(111)[0 1]、(1 1)[011]滑移系，表现为交叉滑移；而[314]取向开启(111)[ 10]滑移系，表现为单滑移。不同晶体取向激活的滑移系统及数量不同，滑移引起的塑性变形区扩展方向不同，由此造成不同的延伸率。室温下，不同取向的合金为类解理断裂机制。不同晶体取向的合金，开启滑移系的数目与难易程度不同，呈现出不同的断口形貌特征。

关键词 镍基单晶高温合金；原位拉伸；微观变形；各向异性

中图分类号：TB31; TG132.3+2; TG14; V19; TG115. 21+5.3文献标识码：A  doi:10.3969/j.issn.1000-6281.2023.02.002

 

In-situstudy of tensile deformation behavior of nickel-based single crystal superalloys with two different orientations

 

REN Xiao-yi1, LU Jun-xia1, ZHOU Jian-li1, LIU Xian-qiang1, WANG Jin2, ZHANG Yue-fei2*, ZHANG Ze2

(1. Beijing University of Technology, Faculty of Materials and Manufacturing, Beijing 100124; 2. Zhejiang University, School of Materials Science and Engineering, Hangzhou Zhejiang 310027, China)

Abstract  Based on the in-situ tensile test system developed by our group, the relationship between the tensile deformation fracture behavior and the microstructure evolution of the second-generation nickel-based single-crystal superalloy along [001] and [314] directions at room temperature were investigated by combining scanning electron microscope (SEM) with digital image correlation method (DIC). The results show that nickel-based single-crystal superalloys have anisotropic mechanical properties. The tensile deformation at room temperature is dominated by the slip bands shearing γ′ phase.The [001] orientated specimen shows the cross-slip character by launching (111)[0 1] and (1 1)[011]slip systems. In contrast, the [314] orientated specimen shows a single-slip character based on (111)[ 10]slip system. Specimens with different crystal orientations have different slip systems. Accordingly, specimens have different elongation rates due to different extension directions of plastic deformation region caused by slips. The alloys with different orientations show a cleavage-like fracture mechanism at room temperature. Alloys with different crystal orientations have different amounts of slip systems, and they show different fracture morphological characteristics.

Keywords   nickel-based single-crystal superalloy; in-situ tension; micro-deformation; anisotropy

 

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