Laser 3D Printing of Iron Based Bulk Amorphous Alloy Composite
ZHANG Yueyuan1 , HUANG Guokun2 , LÜ Yunzhuo3
( 1. Department of Mechanical Engineering, Anshan Technician College, Anshan 114016, China; 2. Shenyang Railway Signal Co., Ltd., Shenyang 110020, China; 3. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China )
摘要Fe 基非晶合金因强度高、硬度高、软磁性能优异等优势，得到人们极大关注。然而，目前实验室和工业领域利用铜模铸造法所能制备的 Fe 基非晶合金尺寸仍然较小，这严重制约了 Fe 基非晶合金作为结构材料在工业领域的实际应用。激光 3D 打印技术的出现为解决上述问题提供了难得的契机。然而，目前国内外的研究中，利用激光 3D 打印技术制备 Fe 基非晶合金存在较为严重的裂纹，所以无法利用该技术成型大尺寸的样品。在 Fe 基非晶合金中引入塑性较好的第二相来吸收热应力，防止在激光 3D 打印过程中发生开裂，能成功打印出大尺寸的 Fe 基非晶合金复合材料。通过上述方法成型的大尺寸 Fe 基非晶合金复合材料，宏观上没有裂纹发生且成型性良好，但微观上仍在局域发现微小裂纹。由于 Cu 将 Fe 基非晶合金包裹在中间，所以这些局域的微裂纹没有扩展，也没有贯穿整个材料，打印的 Fe 基非晶合金复合材料成型性没有受到较大影响。
Abstract：Fe-based amorphous alloy has attracted great attention due to its excellent soft magnetic properties, high hardness, high strength and other advantages. However, the size of Fe-based amorphous alloys prepared by copper mold casting in laboratory and industrial fields are still small, which seriously restricts the practical application of Fe-based amorphous alloys as structural materials in industrial fields. The laser 3D printing method provides an opportunity to solve these problems. However, according to the current research reports at home and abroad, there are serious cracks in Fe-based amorphous alloy prepared by laser 3D printing technology, so it is impossible to use this technology to shape large size Fe-based amorphous alloy samples. In this paper, a second phase with better plasticity was introduced into Fe-based amorphous alloy to absorb thermal stress and prevent the cracking of Febased amorphous alloy in the process of laser 3D printing, and large size Fe-based amorphous alloy composites were successfully printed. It is found that the large-size Fe-based amorphous alloy composites formed by the above method have no macroscopic cracks and have good formability, but microcosmic cracks are still found in the local area of Fe-based amorphous alloy. Since Cu wrapped Fe-based amorphous alloy in the middle, these local microcracks did not expand, so it did not run through the whole material, so that the molding property of the printed Fe-based amorphous alloy composite material was not greatly affected.
2020, 
