Co对Ni50 - xCoxMn29Ga21形状记忆合金带

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Transactions Pub Date : 2023-11-01 DOI:10.2320/matertrans.mt-m2023077

Nguyen Hai Yen, Kieu Xuan Hau, Nguyen Huy Ngoc, Pham Thi Thanh, Truong Viet Anh, Nguyen Huy Dan

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引用次数: 0

摘要

本文研究了Co对熔体纺丝法制备Ni50−xCoxMn29Ga21 (x = 0,2,4,6和8)形状记忆合金带的结构和磁性能的影响。Co的加入增加了合金带中奥氏体晶相的形成。直径为~ 2µm、长度为~ 10µm的棒状晶粒大多垂直于带状表面。用热磁化法和差示扫描量热法分别进行了马氏体-奥氏体相变。随着Co浓度的增加，合金的马氏体-奥氏体组织相变温度(TM-A)逐渐降低，而合金的奥氏体相居里温度(TCA)从355 K (x = 0时)升高到432 K (x = 8时)，马氏体-奥氏体相变也受外加磁场的显著影响。随着外加磁场的增大，合金的组织相变温度有向低温方向移动的趋势。

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Influence of Co on Structure and Magnetic Properties of Ni50−xCoxMn29Ga21 Shape Memory Alloy Ribbons

In this work, we investigated the influence of Co on the structure and magnetic properties of Ni50−xCoxMn29Ga21 (x = 0, 2, 4, 6, and 8) shape memory alloy ribbons fabricated by using the melt-spinning method. The addition of Co increases the formation of the austenitic crystalline phase in the alloy ribbons. The crystalline grains in rod-shapes with diameter of ∼2 µm and length of ∼10 µm are mostly oriented perpendicular to the ribbon surface. The martensitic-austenitic transformation was performed on both the thermomagnetization and differential scanning calorimetry methods. With the increase of Co concentration, the martensitic-austenitic structural phase transformation temperature (TM-A) of the alloy gradually decreases while the Curie temperature of the austenite phase (TCA) of the alloy increases from 355 K (for x = 0) to 432 K (for x = 8). Besides, the martensitic-austenitic phase transformation is also significantly affected by the external magnetic field. The structural phase transformation temperature of the alloy tends to shift towards lower temperatures as the external magnetic field increases.

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