【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。更多还原

【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,M_s 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 M_s 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.更多还原