H65-IF-H65层状复合材料力学行为的尺寸效应

王坤; 安俊博; 费若渝

H65-IF-H65层状复合材料力学行为的尺寸效应

1.
浙江工贸职业技术学院光电制造学院, 温州 325026
2.
瓯锟科技温州有限公司研发中心, 温州 325026

基金项目: 温州市重大科技创新攻关项目(ZG2019024)

详细信息

通讯作者:
王坤，博士，副教授，硕士生导师，研究方向为特种金属材料设计与制备　E-mail:wangkunccc@zjitc.edu.cn

中图分类号: TG335.81
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- 文章访问数: 38
- HTML全文浏览量: 20
- 被引次数: 0
出版历程
- 收稿日期: 2023-12-20
- 修回日期: 2024-02-19
- 录用日期: 2024-02-26
- 网络出版日期: 2024-03-21

Sizes effect on the tensile behaviors of H65-IF-H65 laminated metal composites

WANG Kun^{1
, ,},
AN Junbo²,
FEI Ruoyu¹

1.
College of Optoelectronic Manufacturing, Zhejiang Industry & Trade Vocational College, Wenzhou 325026, China
2.
Research and Development Center, Okumtec Technology Wenzhou Co., LTD. Wenzhou 325026, China

Funds: Wenzhou key scientific and technological innovation research project (ZG2019024)

摘要

摘要: 采用轧制结合退火的方式制备了厚度为0.12 mm、标距宽度为1~9 mm的H65-IF-H65层状复合材料，并借助EBSD、DIC技术、常规拉伸、原位拉伸和SEM等手段分析了试样宽度对复合材料的力学行为的影响。研究结果表明：层状复合材料中的H65-IF界面在退火过程中未发生元素扩散，界面结合方式为机械结合。随着标距宽度由9 mm 逐渐降低至1 mm，材料的抗拉强度、屈服强度基本保持不变，但总延伸率、均匀延伸率和不均匀延伸率分别由30.3%、23.4% 和6.9%下降至20.3%、18.8%和1.5%，加工硬化能力迅速减弱。与此同时，材料的应变集中程度逐渐加剧，拉伸断口上的韧窝带宽度变小且带内的韧窝数量和尺寸也明显减小，呈现出显著的尺寸效应。H65-IF-H65层状复合材料的尺寸效应主要源于剪切应力的交互作用随着标距宽度的降低而被抑制，裂纹更易沿单道剪切带快速扩展而导致塑性下降。
- 层状复合材料 /
- 尺寸效应 /
- 拉伸断口 /
- 原位拉伸 /
- 裂纹扩展
Abstract: The H65-IF-H65 laminated metal composites (LMCs) of 0.12 mm thickness and 1-9 mm gauge widths were prepared by rolling combined with annealing. The EBSD, digital image correlation technology, conventional tensile testing, in-situ tensile testing and SEM were used to analysis the effect of specimen width on the mechanical behavior of the H65-IF-H65 LMC. The results show that the H65-IF interface is mechanical bonded without elements diffusion during the annealing process. As the gauge width gradually reduced from 9 mm to 1 mm, the tensile strength and yield strength remain basically unchanged, meanwhile the total, the uniform, and the non-uniform elongations decrease from 30.3%, 23.4% and 6.9% to 20.3%, 18.8% and 1.5% respectively. The work hardening ability also decreases rapidly. Moreover, the strain of the H65-IF-H65 LMCs is gradually concentrated. On the tensile fracture, the width of the dimple band and the number and size of dimples within it also decrease significantly, which indicates a significant size effect. The main reason of sample sizes effect on the tensile behaviors of H65-IF-H65 LMCs is that the interaction of shear stress is inhibited with the decrease of the gauge width. The cracks are more likely to spread rapidly in the single shear band and result in a decreased ductility.
- laminated metal composites /
- size effect /
- tensile fracture /
- in-situ tension /
- crack propagation

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图 1 H65-IF-H65层状复合材料制备流程示意图

Figure 1. Preparation process diagram of the H65-IF-H65 LMCs

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图 2 H65-IF-H65层状复合材料横截面SEM观察(a)及元素分布(b)

Figure 2. SEM observation (a) and elements distribution analysis (b) of the cross section of the H65-IF-H65 LMCs

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图 3 H65-IF-H65层状复合材料横截面显微结构EBSD分析(a)以及IF层和H65层的反极图(b)及φ₂=45^o的ODF截面图(c)

Figure 3. EBSD analysis (a) of cross section microstructure of the H65-IF-H65 LMCs, and the inverse pole figures (b) and φ₂=45°orientation distribution function sections (c) of IF layer and H65 one

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图 4 H65-IF-H65层状复合材料中的IF层(a)和H65层(b)的晶粒尺寸分布

Figure 4. Grain size distributions of IF layer (a) and H65 layer (c) in the H65-IF-H65 LMCs

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图 5 (a)不同标距宽度H65-IF-H65层状复合材料工程应力-应变曲线；(b)标距宽度1 mm、3 mm和9 mm试样的真应力、应变硬化率-真应变曲线

Figure 5. Engineering stress-strain curves of H65-IF-H65 LMCs with different gauge widths (a); true stress and strain hardening rate vs. true strain curves of samples with gauge widths of 1 mm, 3 mm and 9 mm (b)

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图 6 H65-IF-H65层状复合材料各类延伸率(a)及强度(b)随标距宽度的变化关系

Figure 6. Variation of different elongations (a) and strengths (b) of H65-IF-H65 LMCs with the change of the gauge widths

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图 7 (a)~(c)标距宽度为1 mm的H65-IF-H65层状复合材料试样拉伸至工程应变约为10%、18.8%(颈缩点)和20%(即将断裂)的应变分布图；(d)~(f)标距宽度为9 mm试样拉伸至工程应变约为10%、29.3%(颈缩点)和37.3%(即将断裂)的应变分布图

Figure 7. Strain distributions of the H65-IF-H65 LMCs specimens with gauge width of 1 mm at the strains of 10%, 18.8% (necking point) and 20% (about to break) ((a)-(c)), and 9 mm at the strains of 10%, 29.3% (necking point) and 37.3% (about to break) ((d)-(f)), respectively

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图 8 标距宽度为1 mm(a)和9 mm(b)的H65-IF-H65层状复合材料拉伸至工程应变18.8%(颈缩点)和29.3%(颈缩点)时的表面形貌及相应的粗糙度曲线(c)

Figure 8. Surface morphologies of the H65-IF-H65 LMCs specimens with gauge widths of 1 mm (a) and 9 mm (b) at the strains of 18.8% (necking point) and 29.3% (necking point) and their surface roughness curves (c)

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图 9 标距宽度为1 mm((a)~ (d))和9 mm((e)~ (h))的H65-IF-H65层状复合材料试样在裂纹扩展过程中的侧面SEM观察((i)和(j)为(f)中裂纹前端放大图与EDS分析，(k)和(l)分别为(f)和(h)在电镜下拍摄的宏观照片)

Figure 9. Side SEM observations during the crack growth of the H65-IF-H65 LMCs samples with gauge widths of 1 mm ((a)-(d)) and 9 mm ((e)-(h)) ((i) and (j) are the enlarged image and EDS analysis of the crack front in (f). (k) and (l) are the macroscopic photographs of (f) and (h) under electron microscope)

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图 10 标距宽度1 mm(a)和9 mm(d)的H65-IF-H65层状复合材料试样断口正面SEM图像：(b)和(c)分别为(a)中红色和绿色框位置放大图；(e)和(f)分别为(d)中红色和绿色框位置放大图

Figure 10. SEM images of the front side of the H65-IF-H65 LMCs specimen with gauge width of 1 mm (a) and 9 mm (d): (b) and (c) are the enlarged images of the red and green frames in (a); (e) and (f) are the enlarged images of the red and green frames in (d)

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表 1 H65黄铜-IF钢-H65黄铜(H65-IF-H65)层状复合材料中H65黄铜和IF钢成分(wt%)

Table 1. Compositions of H65 brass and IF steel in the H65-IF-H65 laminated metal composites (LMCs) (wt%)

Material Elements

H65 Cu Zn P Fe Impurities

64.524% Bal. ≤0.01% 0.016% <0.2%

IF Fe C Mn Cu Ni Cr P S

Bal. 0.003% 0.18% 0.01% 0.01% 0.01% 0.03% 0.004%

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