(鋼鐵研究總院 功能材料研究所， 北京 100081)
摘 要: 采用快淬技術(shù)制備了Ni-Mn-Ga薄帶合金， 研究了不同淬速對Ni-Mn-Ga快淬合金相變過程的影響。 結(jié)果表明， 快淬合金具有典型的熱彈性馬氏體相變過程， 但合金的馬氏體相變開始溫度Ms比鑄態(tài)合金的有所降低， 并隨淬速的升高， 快淬合金的Ms逐漸降低。 Ni-Mn-Ga合金馬氏體相變的熱力學(xué)分析表明： 快淬合金晶粒愈細(xì)小， Ms愈低； 快淬工藝不改變合金的晶體結(jié)構(gòu)； 在不同淬速的快淬合金中有以(400)晶面為擇優(yōu)取向的織構(gòu)存在。
關(guān)鍵字: Ni-Mn-Ga； 磁性形狀記憶合金； 馬氏體相變； 快淬
QI Yan, QUAN Bai-yun, WANG Xin-lin
（ 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
