Effects of CeO2, Si and Co on the microstructure and properties of Ni–Cu composite coating on 6061 aluminium alloy by laser cladding

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2021-08-03 DOI:10.1080/09500839.2021.1933235

Pengfei Zhang, Yuxin Li

引用次数: 3

Abstract

ABSTRACT Ni–Cu composite coatings have been fabricated on a 6061 aluminium alloy surface using a pulsed Nd-YAG laser. The basic coating was Ni–Cu powder with a Ni:Cu ratio of 4:1. The effects of adding to this powder 0.9 wt.% CeO2, 0.9 wt.% Si and 0.9 wt.% Co on the microstructure, microhardness and wear properties of the coatings have been investigated. The results show that, on adding the CeO2, Si or Co powders, the microstructure of the top region of the coating is mainly composed of equiaxed grains, dendritic crystals and fine equiaxed crystals, whereas the bottom region mainly consists of long rod-like, dendritic crystals and some particles. The average microhardness of the 99.1 wt.% Ni–Cu + 0.9 wt.% CeO2 coating is 529.05 HV, which was about four times higher than that of the bare 6061 aluminium alloy. In addition, the average friction coefficient decreased on adding CeO2, Si and Co powder to the Ni–Cu composite coating.

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CeO2、Si和Co对6061铝合金激光熔覆Ni-Cu复合镀层组织和性能的影响

摘要采用脉冲Nd-YAG激光在6061铝合金表面制备了Ni–Cu复合涂层。基本涂层为Ni–Cu粉末，Ni∶Cu比例为4:1。研究了添加0.9wt.%CeO2、0.9wt.%Si和0.9wt.%Co对涂层微观结构、显微硬度和耐磨性能的影响。结果表明，添加CeO2、Si或Co粉末后，涂层顶部区域的微观结构主要由等轴晶粒、树枝状晶体和细小的等轴晶体组成，而底部区域主要由长棒状、树枝状结晶和一些颗粒组成。99.1 wt.%Ni–Cu的平均显微硬度 + 0.9wt.%CeO2涂层为529.05HV，这大约是裸6061铝合金的四倍。此外，在Ni–Cu复合涂层中添加CeO2、Si和Co粉末后，平均摩擦系数降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.