A comparison of crystallization behaviors of laser spot welded Zr-Cu-Ag-Al and Zr-Cu-Ni-Al bulk metallic glasses

Huei Sen Wang, Yan Zong Su, Jason Shian-Ching Jang, Hou Guang Chen

研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)

摘要

A novel Ni-free Zr-Cu-Ag-Al ((Zr48Cu36Ag 8Al8)Si0.75) and a Zr-Cu-Ni-Al ((Zr 53Cu30Ni9Al8)Si0.5) bulk metallic glass (BMG), for comparison, were employed for Nd:YAG laser spot welding with three pre-selected energy inputs, including a low (6.2 J), a medium (8.0 J) and a high (9.2 J) energy input. After the welding process, the microstructure evolution, glass-forming ability (GFA) and mechanical properties of the welded samples were determined by a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC) and the Vicker's microhardness test. The results showed the Zr-Cu-Ag-Al BMG has better weldability than the Zr-Cu-Ni-Al BMG. No crystallization was observed in the weld fusion zones (WFZs) or heat-affected zones (HAZs) of the welds under three pre-selected energy inputs. Therefore, the GFA indices of ΔTx (ΔTx = Tx - Tg, Tx is the crystallization temperature and T g is the glass transition temperature), γ (γ = T x/(Tg + Tl), Tl is the liquidus temperature) and γmm = (2Tx - Tg)/Tl), and the mechanical properties of the Zr-Cu-Ag-Al BMG welds did not differ significantly in comparison to the parent material (PM). For Zr-Cu-Ni-Al BMG, HAZ crystallization was unavoidable when a lower energy input was used; therefore, the GFA indices and mechanical properties of the weld were affected. Furthermore, when the GFA indices, ΔTx, γ and γm, were used to predict the thermal stability of the BMG HAZs, ΔTx seemed to correspond more directly to the HAZ crystallization behaviors in this study. It was observed that the ΔT x value of Zr-Cu-Ag-Al BMG was about 26% higher compared to that of Zr-Cu-Ni-Al BMG.

原文???core.languages.en_GB???
頁(從 - 到)215-219
頁數5
期刊Materials Chemistry and Physics
139
發行號1
DOIs
出版狀態已出版 - 15 4月 2013

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