摘要
系统研究了热处理对Ti_(44)Ni_(47)Nb_9合金热轧棒材的组织和相变温度的影响.结果表明,Ti_(44)Ni_(47)Nb_9合金在750～950℃保温30 min淬火后,发生了回复和再结晶,合金由TiNi基体相、沿基体相晶界和亚晶界分布的β-Nb相以及少数(Ti,Nb)_4Ni_2O氧化物相组成;退火后在基体相晶界和晶内分布的β-Nb相颗粒明显增多,氧化物相的数量也增加;淬火并时效后,β-Nb主要分布在基体相的晶界处,氧化物含量稍有增加.氧化物的存在和β-Nb相的析出使退火或淬火并时效后样品基体相中的Ni/Ti比值增大.慢冷或淬火后时效降低了合金的M_s点,提高了马氏体相变的稳定性.
Effect of heat treatment on M_s and microstructure of hot rolled Ti_(44)Ni_(47)Nb_9 rods
has been studied in detail by means of X-Ray. SEM, TEM, DSC. Microstructure of Ti_(44)Ni_(47)Nb_9 alloy
quenched from 750℃/30 min to 950℃/30 min mainly consists of TiNi matrix phase and β-Nb
phase distributed at TiNi grain boundaries and sub-grain boundaries, and the amount of oxide (Ti,
Nb)_4Ni_2O is very low, recovery and recrystallization were observed in matrix phase. The amount of
β-Nb at TiNi grain boundaries and inside grains obviously increases, and the oxide amount also rises
for the annealed alloys;β-Nb mainly distributes at TiNi grain boundaries, the amount of oxide slightly
increases for the alloys aged after solution treatment.Slow cooling or aging after solution treatment
increases Ni/Ti ratio in matrix phase,decreases M_s,and stabilizes martensite.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2004年第2期199-204,共6页
Chinese Journal of Materials Research
基金
成都军用舰船核动力高性能燃料及材料国防科技重点实验室资助项目51481130101ZK0601
