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Ni₂₅Al₇₅合金快速凝固过程中的包晶反应与凝固进程

Peritectic reaction and solidification path in Ni-Al alloy during rapidly solidification process

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【Author】 BA Fahai1, SHEN Ningfu2, YU Gang1 Chinese Academy of Sciences, Beijing 100080, China; 2. Materials Research Center, Zhengzhou University, Zhengzhou 450002, China)

【机构】中国科学院力学研究所非线性力学国家重点实验室；郑州大学材料研究中心；中国科学院力学研究所非线性力学国家重点实验室北京100080；郑州450002；北京100080；

【摘要】用平面流铸技术制备了Ni25Al75合金条带,利用XRD,TEM和EDS对快速凝固后的显微组织和微区成分进行了分析。研究表明,Ni Al合金快速凝固过程中的包晶反应受到了很大程度的抑制,从而影响到快速凝固进程,造成最终相组成中出现了平衡条件下不可能出现的α(Al),并使NiAl3相有效合金浓度和生长速度增加,导致最终相组成中NiAl3相质量分数增加。更多还原

【Abstract】 Rapidly solidified ribbons of Ni25Al75 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 NiAl3 phase are increased, which leads to the increase of the mass fraction of NiAl3 phase.更多还原