(钢铁研究总院 功能材料研究所， 北京 100081)
摘 要: 采用快淬技术制备了Ni-Mn-Ga薄带合金， 研究了不同淬速对Ni-Mn-Ga快淬合金相变过程的影响。 结果表明， 快淬合金具有典型的热弹性马氏体相变过程， 但合金的马氏体相变开始温度Ms比铸态合金的有所降低， 并随淬速的升高， 快淬合金的Ms逐渐降低。 Ni-Mn-Ga合金马氏体相变的热力学分析表明： 快淬合金晶粒愈细小， Ms愈低； 快淬工艺不改变合金的晶体结构； 在不同淬速的快淬合金中有以(400)晶面为择优取向的织构存在。
关键字: Ni-Mn-Ga； 磁性形状记忆合金； 马氏体相变； 快淬
（ Functional Material Research Institute,
Central Iron and Steel Research Institute, Beijing 100081, China）
Abstract: Ni-Mn-Ga ribbons were prepared by melt-spinning technology. The effects of quenching rates on phase transformation of Ni-Mn-Ga melt-spinning alloy were investigated. The results show that Ni47Mn32Ga21 melt-spun ribbons undergo typical thermal-elastic martensitic transformation and magnetic transition. However, Ms of melt-spun ribbons is lower than that of as-cast alloy and decreases with increasing quenching rate. Based on transformation thermodynamics analysis, the smaller the grain sizes of melt-spun alloys are, the lower the Ms is. The melt-spinning technology does not change the crystal structure of the alloy. There exist obvious textures with (400) crystal plane preferential oriented crystal structure in the melt-spun alloys with different quenching rates.
Key words: Ni-Mn-Ga; magnetic shape memory alloy; martensitic transformation; melt-spinning
