Precipitation and growth behavior of mushroom-like Ni3Al

Precipitation and growth behavior of mushroom-like Ni3Al
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蘑菇状Ni3Al的沉淀和生长行为

DOI:
10.1016/j.matlet.2017.09.033
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发表时间:
2018-01
期刊:
影响因子:
3
通讯作者:
Yongchang Liu
Yongchang Liu
中科院分区:
材料科学3区
文献类型:
--
作者:
Jian Ding;Shan Jiang;Yuting Wu;Yanmo Li;Xingchuan Xia;Chong Li;Yongchang Liu

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采用短时循环热处理方法研究了JG4246 A Ni3Al基合金中蘑菇状Ni3Al相沿着双相(γ + γ′)和共晶γ − γ′区界面的析出和生长行为。结果表明,在循环热处理过程中,沿双相(γ + γ′)和共晶γ − γ′区界面沿着形成空位、小角度晶界和位错,促进了Ni3Al相沿着析出。此外,共晶γ − γ′区和双相(γ + γ′)区之间Al元素的浓度梯度以及位错提供的更快的管道扩散有助于定向蘑菇状Ni3Al相的生长。
Precipitation and growth behavior of mushroom-like Ni3Al phase along the dual phase (γ + γ′) and eutectic γ − γ′ area interfaces of as-cast JG4246A Ni3Al-based alloy were investigated by using short time cyclic heat treatment. Results showed that vacancies, small angle grain boundaries and dislocations formed along the dual phase (γ + γ′) and eutectic γ − γ′ area interfaces during the cyclic heat treatment, which promoted the precipitation of Ni3Al phase along this location. In addition, concentration gradient of Al elements between the eutectic γ − γ′ area and dual phase (γ + γ′) areas and the more rapid pipe diffusion provided by dislocations contributed to growth of directional mushroom-like Ni3Al phase.
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