Abstract

Investigations of the Ni₃(Al,V,Ti) alloys with 5 at.% Ti addition show that high quenching rates from the liquid state allow for the preservation of the metastable Ni(Al,V,Ti) solid solution at low temperatures as well as for the limitation of the eutectoid decomposition range. Annealing at the temperatures close to the eutectoid decomposition causes an increase in the amount of the Ni₃Al and Ni₃V equilibrium phases, as well as the precipitation of the Ni₃Ti phase. The V addition reveals the ability to stabilize Ni solid solution, while Ti retards Ni₃V phase precipitation but also supports the precipitation of the Ni₃Ti phase, in spite of the higher than 5 at.% range of Ti solubility in the Ni₃V phase. The increase in V and Ti content at the cost of a decrease in Al content strongly increases micro-hardness of the alloys crystallized at high rates. For the alloys containing predominantly V, increased ductility was noticed in the temperature range of the dissolution of Ni₃V precipitates.

中文翻译：

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Ti和高冷却速率对Ni 3（Al，V）合金相平衡和性能的影响

摘要

对Ti ₃添加量为5 at。％的Ni ₃（Al，V，Ti）合金的研究表明，液态的高淬灭速率可在低温下保存亚稳态Ni（Al，V，Ti）固溶体，因为以及对共析分解范围的限制。在接近共析分解的温度下退火导致Ni ₃ Al和Ni ₃ V平衡相的量增加，以及Ni ₃ Ti相的沉淀。V的添加显示出稳定Ni固溶体的能力，而Ti阻止了Ni ₃ V相的析出，但也支持了Ni ₃的析出。尽管Ti在Ni ₃ V相中的溶解度高于5 at。％，但仍具有Ti相。以减少铝含量为代价的V和Ti含量的增加极大地提高了以高速率结晶的合金的显微硬度。对于主要包含V的合金，在Ni ₃ V沉淀物溶解的温度范围内，塑性得到了提高。