نتایج جستجو برای: shape memory alloy
تعداد نتایج: 487047 فیلتر نتایج به سال:
This paper presents a simple method to examine whether a ferromagnetic shape memory alloy can be used as an actuator by controlling the transformation temperature by magnetic field. Both Fe–Pd and NiAlCo alloys are studied. The analysis results show the recently discovered alloy of NiAlCo cannot be used. Although an Fe–Pd alloy can be used, in principle, for magnetic field actuation, the work e...
In this investigation, Ni47Mn40Sn13 ferromagnetic shape memory alloy was prepared by mechanical alloying. The metal powders were ball milled in argon atmosphere for 20 hours. X-ray diffraction pattern confirmed formation of crystalline structure of Heusler alloy. As-milled powder samples were sealed in quartz tubes under high vacuum and subjected to heat treatments at 950°C for different time d...
Shape memory alloy (SMA) thin films, especially those based on Ni-Ti, have received considerable attention since it was demonstrated that they can undergo a nearly perfect shape memory effect [1-7]. When SMA films are used as actuators in MEMS devices, biasing springs are generally needed to restore the initial state in order to achieve a twoway shape memory effect. As a result, use of SMA actu...
An analysis of the shape memory effect a NiTi alloy by using spark plasma sintering approach has been carried out. Spark Ti50Ni50 powder (20–63 µm) at temperature 900 °C produced specimens showing good effects. However, sample showed 2.5% porosity due to load 48 MPa. Furthermore, an apparent was recorded and were characterized uniformity in chemical composition alloys significant austenite phas...
It is well known that the Fe based alloys can exhibit shape memory effect due to the y to E martensitic transformation. The effect may not be as striking as observed in the NiTi alloy but it might become attractive fkom the practical point of view. In this work, two compositions of Fe-Cr-Ni-Mn-Si(-Co) stainless steel based shape memory alloy, prepared by the VIM technique, will be presented. Th...
This work focuses on application of the laser forming process to NiTi shape memory alloys. While all NiTi shape memory alloys exhibit both superelasticity and the shape memory effect, this study is restricted to a temperature range over which only the superelastic effect will be active. Specifically, this work addresses laser forming induced macroscopic bending deformations, postprocess residua...
This work focuses on application of the laser forming process to NiTi shape memory alloys. While all NiTi shape memory alloys exhibit both superlasticity and the shape memory effect, this study is restricted to a temperature range over which only the superelastic effect will be active. Specifically, this work addresses laser forming induced macroscopic bending deformations, post process residua...
We predict the existence of a new ferromagnetic shape memory alloy Ga2MnNi using density functional theory. The martensitic start temperature (TM ) is found to be approximately proportional to the stabilization energy of the martensitic phase (δEtot) for different shape memory alloys. Experimental studies performed to verify the theoretical results show that Ga2MnNi is ferromagnetic at room tem...
یک سیستم سازه ای جدید، بر اساس فن جداسازی پایه و کاربرد مصالح هوشمند، برای کنترل سازه ها در مقابل زلزله مطرح و مورد مطالعه قرار گرفته است. با توجه به قابلیت های بالای جداسازی لغزشی (بخصوص حالت اصطکاک محض؛ pure friction) و خاصیت حافظه ی شکل (shape memory) در دستیابی به کنترلی موثر، این دو رفتار ویژه جهت طرح به صورت تعاملی مدنظر قرار گرفته اند. سیستم پیشنهاد شده از تکیه گاه های لغزشی تخت (flat sl...
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