(1. 中國科學(xué)院 力學(xué)研究所 非線性力學(xué)國家重點(diǎn)實(shí)驗(yàn)室，
北京 100080;
2. 鄭州大學(xué) 材料研究中心， 鄭州 450002)
摘 要: 用平面流鑄技術(shù)制備了Ni25Al75合金條帶，利用XRD， TEM和EDS對快速凝固后的顯微組織和微區(qū)成分進(jìn)行了分析。 研究表明， Ni-Al合金快速凝固過程中的包晶反應(yīng)受到了很大程度的抑制， 從而影響到快速凝固進(jìn)程， 造成最終相組成中出現(xiàn)了平衡條件下不可能出現(xiàn)的α（Al）， 并使NiAl3相有效合金濃度和生長速度增加， 導(dǎo)致最終相組成中NiAl3相質(zhì)量分?jǐn)?shù)增加。
關(guān)鍵字: Ni-Al合金； 快速凝固； 包晶反應(yīng)
（1. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics,
Chinese Academy of Sciences, Beijing 100080, China;
2. Materials Research Center, Zhengzhou University,
Zhengzhou 450002, China）
Abstract:Rapidly solidified ribbons of Ni25Al75 were prepared by planar flow casting. The microstructure of the ribbons was investigated by XRD, TEM and EDS. The results show that the peritectic reaction is restrained to great extent during continuous cooling in rapid solidification, which has an significant effect on solidification path. α(Al) occurs in the microstructure of the ribbon, which is impossible in equilibrium condition. The effective alloy concentration and growth velocity of NiAl3 phase are increased, which leads to the increase of the mass fraction of NiAl3 phase.
Key words: Ni-Al alloy;rapid solidification; peritectic reaction
