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The Influence of Time-Dependent Aging Process on the Thermodynamic Parameters and Microstructures of Quaternary Cu 79 –Al 12 –Ni 4 –Nb 5 (wt%) Shape Memory Alloy
Iranian Journal of Science and Technology, Transactions A: Science ( IF 1.7 ) Pub Date : 2020-05-02 , DOI: 10.1007/s40995-020-00876-6
Ibrahim Nazem Qader , Ercan Ercan , Bahar Ali Mohammed Faraj , Mediha Kok , Fethi Dagdelen , Yildirim Aydogdu

The heat treatment techniques are significant methods for improving metals and alloys. Particularly, it is important to control transformation temperature and improve mechanical and physical properties of materials. There are two important parameters that can be controlled, which are temperature and time of aging. In this study, a quaternary Cu79–Al12–Ni4–Nb5 (wt%) alloy was produced using arc melting under an atmosphere control. The alloy was aged isothermally at 1073 K for 1, 2, 3, 6, 12, and 24 h. The map of constituents showed that neither Cu contributed in Nb-rich phases nor Nb dissolved in the matrix. The martensitic phase transformation for as-casted and aged specimens was carried out using a DSC device. The phase transformation was generally shifted to the higher temperature by increasing the time of aging, but the alloy lost its shape memory feature when it was aged for 24 h. XRD and optical microscopy were utilized to investigate characterizations of the alloy. Additionally, the aging introduced multiphases in the alloys and the intensity of XRD peaks was increased by increasing the time of aging up to 3 h.

中文翻译:

时效时效工艺对第四代Cu 79 –Al 12 –Ni 4 –Nb 5(wt%)形状记忆合金热力学参数和微观结构的影响

热处理技术是改善金属和合金的重要方法。尤其重要的是控制转变温度并改善材料的机械和物理性能。有两个重要的参数可以控制,即温度和老化时间。在这项研究中,四元Cu 79 –Al 12 –Ni 4 –Nb 5(wt%)合金是在气氛控制下使用电弧熔化法生产的。合金在1073 K下等温老化1、2、3、6、12和24 h。成分图表明,Cu既不参与富Nb的相,也不溶解于基质中的Nb。铸态和时效试样的马氏体相变是使用DSC设备进行的。通常,通过增加时效时间将相变转移到更高的温度,但是当时效24 h时,合金失去了形状记忆特性。XRD和光学显微镜用于研究合金的表征。另外,时效在合金中引入了多相,并且通过将时效时间增加到3 h而增加了XRD峰的强度。
更新日期:2020-05-02
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