PHASE EVOLUTION OF FeCoCrAlCuNiMox COATINGS BY LASER HIGH-ENTROPY ALLOYING ON STAINLESS STEELS
文献类型：期刊论文
| 作者 | Wu Chenliang; Zhang Song; Zhang Chunhua; Guan Meng; Tan Junzhe |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2016 |
| 卷号 | 52期号:7页码:797-803 |
| ISSN号 | 0412-1961 |
| 关键词 | SOLID-SOLUTION MICROSTRUCTURE SURFACE ELEMENTS stainless steel laser high-entropy alloying phase constituent microhardness |
| 其他题名 | PHASE EVOLUTION OF FeCoCrAlCuNiMo_x COATINGS BY LASER HIGH-ENTROPY ALLOYING ON STAINLESS STEELS |
| 英文摘要 | High-entropy alloys (HEAs), defined as solid solution alloys which have at least 5 principal elements but no more than 13 elements, with concentrations of each principal element ranging from 5% to 35% in atomic fraction, are emerging as one of the hot research frontiers in the metallic materials field. The significance of HEAs originates from their various combinations of high strength, good thermal stability and excellent resistance to corrosion, wear and oxidation. HEAs exhibit simple solid solutions with bcc and/or fcc structure(s) due to the effect of high mixing entropy in the solid solution state of HEAs, which may make the HEAs with improved mechanical and physical properties. However, a small quantity of intermetallic compounds can also form in certain HEAs, indicating that the formation of simple solid solutions cannot solely depend on the high mixing entropy. Then, the theory of HEAs based on the concept of entropy-enthalpy competition to judge whether or not simple phases will form was proposed. However, even if an alloy meets these criterions, it can still contain intermetallic phases. Why and how these intermetallics form in HEAs needs much more clarification. In this work, Co-Al-Cu-Ni-Mo-x (x=0, 0.5, 1) powder system with close-to-equiatomic ratios was mixed and laser surface alloyed onto 2Cr13 stainless steel substrates, and then the FeCoCrAlCuNiMox HEA coatings were obtained by reaction synthesis of Fe, Cr with Co-Al-Cu-Ni-Mo-x powder. The phase transition mechanism, microstructure and microhardness of FeCoCrAlCuNiMox coatings were investigated by XRD, SEM, EDS and microhardness tester. Experimental results showed that the principal elements of Fe, Cr in 2Cr13 stainless steel substrate participated in surface alloying process during the laser irradiation, forming FeCoCrAlCuNiMox laser high-entropy alloying coatings. With the increase of Mo content, the crystal structures of FeCoCrAlCuNiMox laser high-entropy alloying coatings evolved from fcc+bcc two-phase solid solution to fcc+bcc solid solution with hcp phase precipitations. The hcp phases were mainly Ni3Mo and Co7Mo6, and the content of Ni3Mo phase was higher than that of Co7Mo6. The phase formation analysis indicated that besides Omega and delta parameters, solidification temperature of the molten pool must be considered during the phase selection, instead of melting point as suggested previously. The microstructure of the coatings exhibited a typical dendrite structure. With the increase of Mo content, the block-shaped Ni3Mo and Co7Mo6 precipitated in the innerdendritic regions. The microhardness of the FeCoCrAlCuNiMox laser high-entropy alloying coatings was 390 similar to 490 HV, which significantly increased with the increase of Mo content. |
| 语种 | 英语 |
| CSCD记录号 | CSCD:5741680 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/144753]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 作者单位 | 中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | Wu Chenliang,Zhang Song,Zhang Chunhua,et al. PHASE EVOLUTION OF FeCoCrAlCuNiMox COATINGS BY LASER HIGH-ENTROPY ALLOYING ON STAINLESS STEELS[J]. ACTA METALLURGICA SINICA,2016,52(7):797-803. |
| APA | Wu Chenliang,Zhang Song,Zhang Chunhua,Guan Meng,&Tan Junzhe.(2016).PHASE EVOLUTION OF FeCoCrAlCuNiMox COATINGS BY LASER HIGH-ENTROPY ALLOYING ON STAINLESS STEELS.ACTA METALLURGICA SINICA,52(7),797-803. |
| MLA | Wu Chenliang,et al."PHASE EVOLUTION OF FeCoCrAlCuNiMox COATINGS BY LASER HIGH-ENTROPY ALLOYING ON STAINLESS STEELS".ACTA METALLURGICA SINICA 52.7(2016):797-803. |
入库方式： OAI收割
来源：金属研究所
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