In this work, a thorough study on the effects of sulfur-addition in the Cu₅₀Zr₅₀ glass-forming system was conducted using laboratory-based X-ray diffraction (XRD), synchrotron-based high-energy XRD (HESXRD), differential scanning calorimetry, and uniaxial compression testing. We report that the glass-forming ability (GFA), thermal stability, phase transformation sequence during heating and cooling, as well as the mechanical properties of the Cu₅₀Zr₅₀ system are highly sensitive to the sulfur concentration. Proper addition of sulfur can not only stabilize the B2-CuZr phase, but also enhances the GFA of the system. This enables the formation of BMG composites that solely contain a B2 phase, which results in a combination of high strength and substantial plastic strain under compressive loading. The total strains of the newly developed BMG composites with sulfur contents of 0.5 and 1.0 at.% are as large as ∼10 at.%, exceeding the previously reported strains of the Cu₅₀Zr₅₀ BMG by far. These superior properties make the Cu-Zr-S BMG composites a promising candidate material for industrial applications. In addition, it is found that excessive addition of sulfur leads to the precipitation of the Cu₁₀Zr₇ phase upon cooling from the alloy melt and a sulfide phase during heating from the glassy state. HESXRD experiments suggest that the preferential bonding between Zr and S atoms could be the determining structural mechanism on the atomic scale, leading to the changing primary crystallization sequence for heating and cooling. The findings in this work further strengthen the high relevance of sulfur in alloy development and tuning of properties in BMGs, especially considering the low cost, good availability, and non-toxicity of sulfur in the relevant modifications.

_在这项工作中，使用基于实验室的 X 射线衍射 (XRD)、基于同步加速器的高能 XRD (HESXRD)、_微分扫描量热法和单轴压缩测试。_{我们报告了 Cu 50} Zr ₅₀的玻璃形成能力 (GFA)、热稳定性、加热和冷却过程中的相变顺序以及机械性能系统对硫浓度高度敏感。适当加入硫磺不仅可以稳定B2-CuZr相，还可以提高体系的GFA。这使得能够形成仅包含 B2 相的 BMG 复合材料，从而在压缩载荷下产生高强度和显着塑性应变的组合。新开发的含硫量为 0.5 和 1.0 at.% 的 BMG 复合材料的总应变高达 ~10 at.%，远远超过了先前报道的 Cu 50 Zr 50 BMG_的应变_。这些优越的性能使 Cu-Zr-S BMG 复合材料成为工业应用的有前途的候选材料。此外，发现过量添加硫会导致 Cu ₁₀ Zr的析出。合金熔体冷却时为_{7相，加热时为玻璃态为硫化物相。}HESXRD 实验表明，Zr 和 S 原子之间的优先键合可能是原子尺度上的决定性结构机制，导致加热和冷却的初级结晶顺序发生变化。这项工作的发现进一步加强了硫在合金开发和 BMG 性能调整中的高度相关性，特别是考虑到硫在相关改性中的低成本、良好可用性和无毒性。