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首页> 外文期刊>Materials transactions >Formation and mechanical properties of Ti-Zr-Ni-Cu amorphous alloy containing icosahedral nanoscale quasicrystalline phase
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Formation and mechanical properties of Ti-Zr-Ni-Cu amorphous alloy containing icosahedral nanoscale quasicrystalline phase

机译：含二十面体纳米准晶相的Ti-Zr-Ni-Cu非晶合金的形成和力学性能

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摘要

Amorphous Ti{sub}60Zr{sub}15Ni{sub}15Cu{sub}10 alloy ribbons containing an icosahedral quasicrystalline phase were prepared by melt-spinning. The microstructure of this alloy strongly depends on cooling rate, which controlled by the circumferential velocity of copper roll. At a low velocity of 10 m/s, stable α-Ti/Zr, Ti{sub}2Ni and Ti{sub}2Cu crystalline phases are formed. At the velocities of 15 and 20 m/s, an icosahedral quasicrystal phase (1-phase) is formed directly. At the velocities of 25, 30 and 35 m/s, a mixed structure consisting of I- and amorphous phases is formed and the size of I-phase is in the range of 5-50 nm. At the high velocity of 40 m/s, a single amorphous phase is formed. The DSC traces of these melt-spun alloys obtained during continuous heating from room temperature to 1000 K at a heating rate of 0.67 K/s show distinct exothermic peaks. The amount of the first exothermic heat decreases with a decrease of cooling rate, indicating an increase of the precipitated I-phase in these melt-spun ribbons. For the single amorphous phase ribbon, the Vickers microhardness (H{sub}v), tensile fracture strength (σ{sub}f) and distinct plastic elongation (ε) are 460, 1480 and 1.42% respectively. For the nano-scale I-phase bearing amorphous composite ribbons, the σ{sub}f, H{sub}v and ε depend on the volume fraction (V{sub}f) of the I-phase. The maximum σ{sub}f (1650 MPa) and ε (1.52%) was obtained at about V{sub}f = 28% with particle size of 5-20 nm.
机译：通过熔融纺丝制备了含有二十面体准晶相的Ti {sub} 60Zr {sub} 15Ni {sub} 15Cu {sub} 10非晶态合金带。这种合金的微观结构在很大程度上取决于冷却速度，该速度由铜辊的圆周速度控制。在10 m / s的低速下，形成稳定的α-Ti/ Zr，Ti {sub} 2Ni和Ti {sub} 2Cu晶相。以15和20 m / s的速度直接形成二十面体准晶体相（1-相）。在25、30和35 m / s的速度下，形成了由I相和非晶相组成的混合结构，I相的大小在5至50 nm的范围内。以40 m / s的高速度形成一个非晶相。在以0.67 K / s的加热速率从室温连续加热到1000 K的过程中获得的这些熔纺合金的DSC曲线显示出明显的放热峰。随着冷却速率的降低，第一放热量降低，表明在这些熔纺带中析出的I相增加。对于单个非晶相带，维氏显微硬度（H {sub} v），拉伸断裂强度（σ{sub} f）和明显的塑性伸长率（ε）分别为460％，1480％和1.42％。对于带有纳米级I相的非晶复合带，σ{sub} f，H {sub} v和ε取决于I相的体积分数（V {sub} f）。在大约V {sub} f = 28％且粒径为5-20 nm的情况下获得最大σ{sub} f（1650 MPa）和ε（1.52％）。

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