一种高硼定向凝固合金的初熔行为及其对力学性能的影响
张洪伟1,2,秦学智2,李小武1,周兰章2(
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Incipient Melting Behavior and Its Influences on the Mechanical Properties of a Directionally Solidified Ni-Based Superalloy with High Boron Content
Hongwei ZHANG1,2,Xuezhi QIN2,Xiaowu LI1,Lanzhang ZHOU2()
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图1. 高硼DZ444合金的典型铸态组织
Fig.1. SEM (a~d) and TEM (e, f) images of as-cast microstructures of DZ444 alloy with high boron (specimens of Figs.1a and b were etched by electrolyte A which removes the γ’ precipitates in the matrix , specimens of Figs.1c and d were etched by electrolyte B which removes the γ matrix in the alloy)
(a) dendrite morphology (b) γ/γ’ eutectic (c) borides
(d) multi-phase (generally including γ, η, boride and Ni5Hf phases) eutectic-like constituent
(e) TEM image of boride (Inset shows SAED pattern of boride)
(f) TEM image of η and Ni5Hf phases (Insets show SAED patterns of Ni5Hf and η)
