激光3D打印铁基块体非晶复合材料

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。

Laser 3D Printing of Iron Based Bulk Amorphous Alloy Composite

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.