Effect of Alloying Elements on Hardness and Electrical Conductivity of CU Nanocomposites Prepared by Mechanical Alloying

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-03-10 DOI:10.22068/IJMSE.18.1.1

R. M. Babaheydari, S. O. Mirabootalebi, Gholam-Hosein Akbari Fakhrabadi

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引用次数: 3

Abstract

Cu-based alloys have a wide range of applications in the electronics industry, communications, welding industries, etc. Regarding the type and percentage of the second phase, changing in the alloying elements has a significant effect on the mechanical and electrical properties of copper composites. The aim of the present work is to synthesize, investigate, and compare the micro-structure, micro-hardness, and electrical properties of different Cu-based nanocomposites. For this purpose, Cu-Al, Cu-Al2O3, Cu-Cr, and Cu-Ti were fabricated via ball milling of copper with 1, 3, and 6 weight percentages. The vial speed was 350 rpm and the ball-to-powder weight ratio was kept at 15:1. The milling process was performed at different times in Argon. Next, the prepared composites were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), and dynamic light scattering (DLS). Based on XRD patterns, crystallite size, lattice strain, and lattice constant were calculated by Rietveld refinement using Maud software. The results show a decrease of crystallite size, and an increase of the internal strain and lattice constant by rising the alloying elements in all composites. The produced powders compressed via the cold press and annealed at 650 ̊C. Finally; the micro-hardness and the electrical resistance of the manufactured tablets were measured. The results of these analyses show that the micro-hardness is increased by enhancement of the reinforcement material, due to the rising of the work hardening. Cu-6wt%Ti with 312 Vickers and Cu-1wt%Al2O3 with 78 Vickers had the highest and lowest micro-hardness, respectively. Moreover, the results of the electrical resistance indicate a dramatic rise in the electrical resistance by increasing the amount of alloying material, where Cu-1wt%Al with 0.26 Ω had the highest electrical conductivity.

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合金元素对机械合金化CU纳米复合材料硬度和电导率的影响

铜基合金在电子工业、通信、焊接工业等领域有着广泛的应用。关于第二相的类型和百分比，合金元素的变化对铜复合材料的机械和电学性能有着重要影响。本工作的目的是合成、研究和比较不同铜基纳米复合材料的微观结构、显微硬度和电学性能。为此，通过对具有1、3和6重量百分比的铜进行球磨来制备Cu-Al、Cu-Al2O3、Cu-Cr和Cu-Ti。小瓶速度为350rpm，球与粉末的重量比保持在15:1。研磨过程在氩气中的不同时间进行。接下来，通过扫描电子显微镜（SEM）、X射线衍射（XRD）和动态光散射（DLS）对制备的复合材料进行了研究。基于XRD图谱，使用Maud软件通过Rietveld精化计算了晶粒尺寸、晶格应变和晶格常数。结果表明，在所有复合材料中，随着合金元素的增加，晶粒尺寸减小，内部应变和晶格常数增加。所产生的粉末通过冷压机压缩并在650°C下退火。最后测定了制备的片剂的显微硬度和电阻。这些分析结果表明，由于加工硬化度的提高，增强材料的显微硬度增加。维氏硬度为312的Cu-6wt%Ti和维氏硬度为78的Cu-1wt%Al2O3分别具有最高和最低的显微硬度。此外，电阻的结果表明，通过增加合金材料的量，电阻急剧上升，其中0.26Ω的Cu-1wt%Al具有最高的电导率。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.