CuZr-based bulk metallic glass and glass matrix composites fabricated by selective laser melting  

作　　者：Liang Deng Long Zhang Konrad Kosiba RenéLimbach Lothar Wondraczek Gang Wang Dongdong Gu Uta Kühn Simon Pauly 

机构地区：[1]Leibniz IFW Dresden,Institute for Complex Materials,Helmholtzstraße 20,D-01069,Dresden,Germany [2]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [3]Otto Schott Institute of Materials Research,University of Jena,Fraunhoferstraße 6,D-07743 Jena,Germany [4]Laboratory for Microstructure,Institute of Materials,Shanghai University,Shanghai,200444,China [5]College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [6]University of Applied Sciences Aschaffenburg,Würzburger Straße 45,D-63743,Aschaffenburg,Germany

出　　处：《Journal of Materials Science & Technology》2021年第22期139-150,共12页材料科学技术（英文版）

基　　金：L.Deng acknowledges financial support by the Chinese Scholarship Council(CSC);support by German Research Foundation(DFG)(Nos.PA 2275/4-1,PA2275/6-1 and KO5771/1-1);support by the National Natural Science Foundation of China(Nos.51701213 and 51790484);the National key research and development program(2018YFB0703402)。

摘　　要：Monolithic bulk metallic glass and glass matrix composites with a relative density above 98%were produced by processing Cu_(46)Zr_(46)Al_(8)(at.%)via selective laser melting(SLM).Their microstructures and mechanical properties were systematically examined.B2 CuZr nanocrystals(30-100 nm in diameter)are uniformly dispersed in the glassy matrix when SLM is conducted at an intermediate energy input.These B2 CuZr nanocrystals nucleate the oxygen-stabilized big cube phase during a remelting step.The presence of these nanocrystals increases the structural heterogeneity as indirectly revealed by mircrohardness and nanoindentation measurements.The corresponding maps in combination with calorimetric data indicate that the glassy phase is altered by the processing conditions.Despite the formation of crystals and a high overall free volume content,all additively manufactured samples fail at lower stress than the as-cast glass and without any plastic strain.The inherent brittleness is attributed to the presence of relatively large pores and the increased oxygen content after selective laser melting.

关 键 词：Selective laser melting CuZr-based glass Bulk metallic glass matrix composites Phase formation Mechanical properties 

分 类 号：TB33[一般工业技术—材料科学与工程] TG139.8[金属学及工艺—合金]