1.中国矿业大学 机电工程学院,江苏 徐州 221116
2.玉溪大红山矿业有限公司,云南 玉溪 653405
李大利(2001—),男,博士研究生,主要从事表面改性与摩擦学研究,(电子信箱)lidali@cumt.edu.cn。
刘昊(1985—),男,副教授,博士研究生导师,主要从事表面工程、摩擦学和激光增材制造与再制造技术研究,(电子信箱)liuhao56@cumt.edu.cn。
收稿:2025-12-16,
网络首发:2026-04-28,
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李大利,王宏都,刘昊,等.脉冲电流辅助超声滚压技术对激光熔覆高熵合金涂层动态压缩性能的影响[J].宁夏大学学报(自然科学版中英文),XXXX,XX(XX):1-10.
Li Dali,Wang Hongdu,Liu Hao,et al.Effect of Pulsed Current Assisted Ultrasonic Rolling on the Dynamic Compressive Properties of Laser-Cladded Al1.5Co0.5CrFeNi2(TiB)x (x = 0, 0.25) High-Entropy Alloy Coatings[J].Journal of Ningxia University (Natural Science Edition in Chinese and English),XXXX,XX(XX):1-8.
李大利,王宏都,刘昊,等.脉冲电流辅助超声滚压技术对激光熔覆高熵合金涂层动态压缩性能的影响[J].宁夏大学学报(自然科学版中英文),XXXX,XX(XX):1-10. DOI: 10.20176/j.cnki.nxdz.20260407.
Li Dali,Wang Hongdu,Liu Hao,et al.Effect of Pulsed Current Assisted Ultrasonic Rolling on the Dynamic Compressive Properties of Laser-Cladded Al1.5Co0.5CrFeNi2(TiB)x (x = 0, 0.25) High-Entropy Alloy Coatings[J].Journal of Ningxia University (Natural Science Edition in Chinese and English),XXXX,XX(XX):1-8. DOI: 10.20176/j.cnki.nxdz.20260407.
针对深部长壁采煤刮板输送机中部槽在高应变率循环冲击-磨粒磨损耦合作用下易发生表界面失效的问题,以激光熔覆 Al
1.5
Co
0.5
CrFeNi
2
(TiB)
x
(
x
=0,0.25) 高熵合金涂层为研究对象,采用脉冲电流辅助超声滚压(electropulsing-assisted ultrasonic surface rolling process,EP-USRP)技术,构建晶粒尺寸、位错密度与残余应力呈梯度分布的表层强化结构涂层。通过显微硬度测试、纳米压痕实验、电子背散射衍射技术及分离式霍普金森压杆动态压缩实验,分析不同组织形态涂层的组织-性能关系及其失效机制。结果表明:
M
2
B (
M
代表金属元素)增强相,显著提升了涂层的硬度及其
H
v
/
E
、
H
<math id="M1"><msubsup><mrow/><mrow><mi mathvariant="normal">v</mi></mrow><mrow><mn mathvariant="normal">3</mn></mrow></msubsup></math>
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=106956643&type=
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=106956619&type=
1.10066664
3.80999994
/
E
2
等指标,进而提高其变形恢复能力;EP-USRP技术未改变涂层的物相组成,但在涂层表层形成了梯度加工硬化层与压缩残余应力区,这在动态压缩过程中可抑制裂纹贯穿扩展与涂层剥落,进而提升了涂层-基体界面的协同变形能力。涂层动态失效主要源于基体与涂层在压缩变形量上的不匹配,涂层的刚性对涂层-基体界面施加反向拉应力,诱发裂纹与撕裂孔并使其向涂层扩展,而表层梯度强化层有效抑制了裂纹向涂层扩展。研究结果可为合金涂层的设计与工程应用提供参考。
To address the issue of surface interface failure under the coupling effect of high strain cyclic impact and abrasive wear in the central trough of deep long-wall coal mining scrapper conveyors, this study focuses on the laser cladding Al
1.5
Co
0.5
CrFeNi
2
(TiB)
x
(
x
=0, 0.25) high-entropy alloy (HEA) composite coating. Utilizing electropulsing-assisted ultrasonic surface rolling process (EP-USRP) technology, a surfac
e strengthening structure with a gradient distributions of grain size, dislocation density, and residual stress was constructed. Through microhardness testing, nanoindentation experiments, EBSD characterization, and split Hopkinson pressure bar (SHPB) dynamic compression tests, the relationship between the microstructure and performance of coatings with different morphological forms, as well as their failure mechanisms, were analyzed. The results indicate that the
M
2
B(
M
represents metal elements) reinforcing phase significantly enhances the hardness of the coating and improves indicators such as
H
v
/
E
and
H
<math id="M2"><msubsup><mrow/><mrow><mi mathvariant="normal">v</mi></mrow><mrow><mn mathvariant="normal">3</mn></mrow></msubsup></math>
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=106956604&type=
https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=106956633&type=
1.18533325
4.40266657
/
E
2
, thereby improving the coating’s deformation recovery capability. The EP-USRP did not change the phase composition of the coatings; however, the gradient work-hardened layer and compressed residual stress zone formed on the coating surface can inhibit crack propagation and coating delamination during dynamic compression, thereby enhancing the cooperative deformation capability of the coating-substrate interface. The dynamic failure of the coating primarily arises form the mismatch in the amount of compressive deformation between the substrate and the coating. The rigidity of the coating applies a reverse tensile stress to the coating-substrate
interface, including cracks and tearing holes that extend into the coating; meanwhile, the surface gradient strengthened layer effectively suppresses the extension of cracks into the coating. The research results can provide references for the design and engineering application of alloy coatings.
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