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首页> 外文期刊>Materials Science and Engineering >Effects of aging on the shape memory and superelasticity behavior of ultra-high strength Ni_(54)Ti_(46) alloys under compression
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Effects of aging on the shape memory and superelasticity behavior of ultra-high strength Ni_(54)Ti_(46) alloys under compression

机译:时效对压缩状态下超高强度Ni_(54)Ti_(46)合金形状记忆和超弹性行为的影响

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摘要

This study investigates the effects of aging on the shape memory and superelasticity behavior of a Ni-rich Ni_54Ti_46 (at%) alloy. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and compression test (thermal cycling under stress and superelasticity) were carried out after 3 h agin;g from 450 °C to 600 °C. The alloys show recoverable shape memory effect with transformation strains of about 1% and narrow hysteresis under high stress levels. The work output of 14.1 Jg-1 was observed at an ultra-high stress level of 1500 MPa after 600 °C 3 h aging. 450 °C 3 h aging resulted in a very narrow temperature hysteresis of 8°C under an ultra-high stress level of 1500 MPa. At room temperature, the superelastic response with 496 total strain was obtained even when high stress level of 2000 MPa is applied after 550 °C 3 h aging.
机译:这项研究调查了时效对富镍Ni_54Ti_46(at%)合金的形状记忆和超弹性行为的影响。从450°C到600°C开始3 h后,进行差示扫描量热法(DSC),X射线衍射(XRD),透射电子显微镜(TEM)和压缩试验(在应力和超弹性下的热循环)。合金显示出可恢复的形状记忆效应,在高应力水平下具有约1%的转变应变和窄的磁滞现象。 600°C 3 h时效后,在1500 MPa的超高应力水平下观察到14.1 Jg-1的功输出。在1500 MPa的超高应力水平下,450°C 3 h时效导致8°C的非常窄的温度滞后。在室温下,即使在550°C 3 h时效后施加2000 MPa的高应力水平,也可以获得496总应变的超弹性响应。

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