摘要
This paper discusses the microstructure of nickel-aluminium bronzes con-taining（9-10）wt% Al and（0.1～5）wt% Ni,in which three eutectoids may exist.Themorphologies of α+γ<sub>2</sub> and α+β’<sub>2</sub> are similar but the latter is finer.In the α+β’<sub>2</sub>+γ<sub>2</sub>eutectoid structure β’<sub>2</sub> is mainly concentrated at the α/β boundaries,while γ<sub>2</sub> is distrib-uted inside prior B regions.Both K-S and N-W orientation relationships exist betweenα and β’<sub>2</sub>（or γ<sub>2</sub>）in alloys consisting of α+β’<sub>2</sub> or α+γ<sub>2</sub>.However,if the alloy consists ofα+β’<sub>2</sub>+γ<sub>2</sub> eutectoid,the lattices of β’<sub>2</sub> and γ<sub>2</sub> are parallel,both of them have the N-Worientation relationship with α.
This paper discusses the microstructure of nickel-aluminium bronzes con- taining(9-10)wt% Al and(0.1～5)wt% Ni,in which three eutectoids may exist.The morphologies of α+γ_2 and α+β'_2 are similar but the latter is finer.In the α+β'_2+γ_2 eutectoid structure β'_2 is mainly concentrated at the α/β boundaries,while γ_2 is distrib- uted inside prior B regions.Both K-S and N-W orientation relationships exist between α and β'_2(or γ_2)in alloys consisting of α+β'_2 or α+γ_2.However,if the alloy consists of α+β'_2+γ_2 eutectoid,the lattices of β'_2 and γ_2 are parallel,both of them have the N-W orientation relationship with α.
