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。
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 Ni47 Mn32 Ga23 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,
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2005年第11期1755-1760,共6页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2001AA327022)
