首页|Toughening additive manufactured Zr-based bulk metallic glass composites by martensite phase transformation

Toughening additive manufactured Zr-based bulk metallic glass composites by martensite phase transformation

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Additive manufacturing technology based on laser powder bed fusion(LPBF)offers a novel approach for fabricating bulk metallic glass(BMG)products without restriction in size and geometry.Nevertheless,the BMGs prepared by LPBF usually suffered from less plasticity and poorer fracture toughness as compared to their cast counterparts due to partial crystallization in heat-affected zones(HAZs).Since crystalliza-tion in HAZs is hard to avoid completely in LPBF BMGs,it is desirable to design a suitable alloy system,in which only ductile crystalline phase,instead of brittle intermetallics,is formed in HAZs.This unique structure could effectively increase the toughness/plasticity of the LPBF BMGs.To achieve this goal,a qua-ternary BMG system with a composition of Zr47.5Ct45.5Al5Co2 is adopted and subjected to LPBF.It is found that nearly a single phase of B2-ZrCu is precipitated in HAZs,while a fully amorphous phase is formed in molten pools(MPs).This B2 phase reinforced BMG composite exhibits excellent mechanical properties with enhanced plasticity and toughness.Furthermore,it is easy to modulate the mechanical properties by altering the amount of the B2 phase via adjusting the laser energy input.Finally,the best combination of strength,plasticity,and notch toughness is obtained in the BMG composite containing 27.4％B2 phase and 72.6％amorphous phase,which exhibits yield strength(σs)of 1423 MPa,plastic strain(εp)of 4.65％,and notch toughness(Kq)of 53.9 MPa m1/2.Furthermore,a notable strain-hardening is also observed.The improvement of plasticity/toughness and appearance of strain-hardening behavior are mainly due to the martensite phase transformation from the B2 phase to the Cm phase during plastic deformation(i.e.,the phase transformation-induced plasticity effect).The current work provides a guide for making advanced BMGs and BMG composites by additive manufacturing.

Laser powder bed fusionBulk metallic glass compositesPhase transformation-induced plasticityDeformation mechanism

Pengcheng Zhang、Cheng Zhang、Jie Pan、Di Ouyang、Lin Liu

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State Key Laboratory of Materials Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China

国家自然科学基金国家自然科学基金湖北省重点研发计划Hubei Young Top Talent programAnalytical and Testing Center,Huazhong University of Science and Technology

52192604522011812022BAA023

2024

10.1016/j.jmst.2023.06.031

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.170(3)
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