EFFECTS OF ANNEALING TREATMENT ON THE PLASTIC DYNAMICS IN A PT-BASED BULK METALLIC GLASS
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摘要: 采用退火的热诱导方法向Pt基块体金属玻璃(Pt-BMG)基体内原位引入纳米晶, 通过纳米压痕实验, 考察了Pt-BMG在铸态和在玻璃转变温度Tg之上(250 °C)退火15 min, 2 h和6 h的力学性能和塑性动力学行为. 研究结果表明, 退火时间从15 min增加到6 h时, Pt-BMG的结晶度从34%增加到57%, 平均晶粒尺寸从25.6 nm增加到38.3 nm, 硬度和折合模量分别从5.66 GPa和133.83 GPa增加到8.65 GPa和182.89 GPa, 同时载荷−位移曲线上的锯齿流变行为呈现从可明显观察到不连续的位移突变到比较平滑的变化规律. 通过分子动力学模拟进一步证明, 随着纳米晶尺寸的增加, 剪切转变区的激活与剪切带的成核呈现先促进后抑制、先增加后减小的趋势. 这是由于金属玻璃在塑性变形过程中, 小尺寸纳米晶会被剪切带所包裹或溶解, 促进了金属玻璃塑性变形的形成; 而大尺寸纳米晶在承受载荷时, 在晶体内部产生了位错和滑移, 进一步抑制了剪切带的成核与传播. 本文结合纳米压痕实验和分子动力学模拟, 从原子尺度上揭示了纳米晶的尺寸影响非晶合金塑性变形的内在机理, 为设计理想性能的金属玻璃提供了有效的实验基础与理论支撑.Abstract: Metallic glasses exhibit promising potential in many engineering applications due to their attractive mechanical properties. Compared to their crystalline counterparts, however, the metallic glasses appear to be inherently brittle. To overcome this limitation, introducing the nanocrystals into the amorphous structure can improve significantly the plasticity of metallic glasses. Nanocrystals were formed in situ into the Pt-based bulk metallic glass (Pt-BMG) matrix using the thermal induction method of annealing. The mechanical properties and plastic dynamics behavior of the as-cast and glass transition temperature Tg (250 °C) annealed for 15 min, 2 h, and 6 h were investigated by nanoindentation experiments. The results show that when the annealing time increases from 15 min to 6 h, the crystallinity of Pt-BMG increases from 34% to 57%, the average grain size increases from 25.6 nm to 38.3 nm, the hardness and reduced modulus increase from 5.66 GPa and 133.83 GPa to 8.65 GPa and 182.89 GPa, respectively. Meanwhile, the serrated flow behaviors on the load-displacement curves show a pattern of obvious discontinuous displacement abrupt to relatively smooth changes. Through molecular dynamics simulations, it has been further demonstrated that as the size of the nanocrystals increases, the activation of the shear transition zone and the nucleation of the shear band exhibit a trend of first promoting, then inhibiting, and first increasing and then decreasing. This is because during the plastic deformation process of bulk metallic glass, small-sized nanocrystals are wrapped or dissolved by shear bands, promoting the formation of plastic deformation of bulk metallic glass; However, large-sized nanocrystals generate dislocations and slip within the crystal when subjected to loads, further suppressing the nucleation and propagation of shear bands. By means of nanoindentation experiment and molecular dynamics simulation, the internal mechanism of nanocrystalline size affecting the plastic deformation of amorphous alloys is revealed from the atomic scale, which provides an effective experimental basis and theoretical support for the design of metallic glasses with ideal properties.
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图 3 Pt-BMG在铸态和在250 °C退火时的XRD谱图和结晶度与平均晶粒尺寸
Figure 3. XRD patterns and crystallinity and average grain size of Pt-BMG as-cast and annealed at 250 °C
图 4 Pt-BMG在铸态和在250 °C退火15 min、2 h、6 h的硬度与折合模量
Figure 4. Hardness and reduced modulus of Pt-BMG in as-cast and annealed at 250 °C for 15 min, 2 h, and 6 h
图 5 Pt-BMG在铸态和在250 °C退火时的载荷−位移曲线与SEM压痕形貌图
Figure 5. Load-displacement curves and SEM indentation topography of Pt-BMG as-cast and annealed at 250 °C
图 6 Pt-BMG在铸态和在250 °C退火时的pop-in事件
Figure 6. Pop-in events of Pt-BMG as-cast and annealed at 250 °C
图 7 分子动力学模拟不同晶粒尺寸的P-h曲线图
Figure 7. MD simulation of P-h curves of different grain sizes
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