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对热变形量56%的高铝Ni3Al基合金在热处理过程中的组织转变进行了研究。结果表明:热处理过程中随β-NiAl相的增大,γ+γ’相区不断向β+γ’相区扩展,借此消除锻后形成的γ’脆性晶界,提高锻后合金的塑性。在γ+γ’两相区,γ’相不断发生回溶;而在β+γ’两相区,随着M23C6向MCⅡ碳化物逆转变的进行,γ相以MCⅡ为形核质点发生再结晶长大。此外于扩大的γ相内有呈方形的粒状γ’相析出,与γ相保持完全共格,可提高合金高温强度。
The microstructure transformation of high aluminum Ni3Al-based alloy with 56% of thermal deformation during heat treatment was studied. The results show that with the increase of β-NiAl phase, the γ + γ ’phase region continues to expand to β + γ’ phase during heat treatment, thereby eliminating the γ ’brittle grain boundaries formed after forging and improving the plasticity of the alloy after forging . In the γ + γ ’two-phase region, the γ’ phase recovers continuously. In the β + γ ’two-phase region, as the M23C6 reverses to the MCⅡ carbide, the γ phase recrystallizes from the MC Ⅱ nucleus grow up. In addition, there is a square granular γ ’phase precipitated in the enlarged γ phase, which is completely coherent with the γ phase, thereby increasing the high temperature strength of the alloy.