铁单元素基合金表面激光高熵合金化涂层的制备*
张 松, 女, 1963年生, 教授, 博士
收稿日期: 2014-01-06
修回日期: 2014-03-04
网络出版日期: 2014-05-20
基金资助
*国家自然科学基金项目51271126, 辽宁省自然科学基金项目2013020101及沈阳市科技局计划项目F13-318-1-52和F13-070-2-00资助
SYNTHESIS OF LASER HIGH ENTROPY ALLOYING COATING ON THE SURFACE OF SINGLE-ELEMENT Fe BASE ALLOY
Received date: 2014-01-06
Revised date: 2014-03-04
Online published: 2014-05-20
Supported by
Supported by National Natural Science Foundation of China (No.51271126), Natural Science Foundation of Liaoning Province of China (No.2013020101) and Shenyang Science and Technology Funded Projects (Nos.F13-318-1-52 and F13-070-2-00)
利用高功率半导体激光器进行合金化处理, 采用等摩尔比的Co, Cr, Al, Cu四主元合金粉末, 在Fe单元素基合金Q235钢表面成功制备出FeCoCrAlCu激光高熵合金化涂层. 利用SEM, XRD, EDS及显微硬度计对FeCoCrAlCu激光高熵合金化层的微观组织形貌、相结构、成分分布及性能进行系统研究. 结果表明: Q235基材主元素Fe在激光辐照时参与了表面合金化过程, 形成了FeCoCrAlCu五主元高熵合金涂层; 合金化层相组成为具有简单bcc结构的固溶体, 显微组织为典型的枝晶组织; 激光高熵合金化层仅在基体界面附近出现了少量σ四方结构中间相, 从高熵合金化层表面到基材, 体系的混合熵呈高熵-中熵-低熵梯度变化; FeCoCrAlCu激光高熵合金化涂层的显微硬度高达8.3 GPa, 为基材Q253钢的3倍以上.
关键词： 单元素基合金; 激光合金化; FeCoCrAlCu; 高熵合金; 涂层
张松 , 吴臣亮 , 王超 , 伊俊振 , 张春华 . 铁单元素基合金表面激光高熵合金化涂层的制备*[J]. 金属学报, 2014 , 50(5) : 555 -560 . DOI: 10.3724/SP.J.1037.2014.00006
FeCoCrAlCu laser high entropy alloying coating has been synthetized by high power semiconductor laser alloying of equimolar ratio of Co, Cr, Al, Cu four elements mixture powder on the surface of single-element Fe base alloy Q235 steel. The microstructure, constituent phases, composition distribution and mechanical properties of FeCoCrAlCu laser high entropy alloying coating were investigated by SEM, XRD, EDS and microhardness tester. Experimental results show that the principal element of Fe in the single-element base alloy Q235 substrate participates surface alloying process during the laser irradiation, forming FeCoCrAlCu five principal high entropy alloy coating. The alloying coating is composed of simple bcc solid solution and the microstructure is mainly composed of typical dendritic structure. Intermediate phase σ with tetragonal structure merely appears near the interface between laser alloying coating and substrate. From the surface of high entropy alloying coating to substrate, it presents the gradual distribution of the mixing entropy from high entropy, medium entropy to low entropy. the microhardness of FeCoCrAlCu laser high entropy alloying coating reaches 8.3 GPa, which is three times as much as that of the Q235 substrate.
Key words： single-element base alloy; laser alloying; FeCoCrAlCu; high entropy alloy; coating
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