کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9796347 1514945 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The effect of TCP morphology on the development of aluminide coated superalloys
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
The effect of TCP morphology on the development of aluminide coated superalloys
چکیده انگلیسی
Aluminisation gives a cost-effective coating for turbine components subjected to hostile environments. However, inter-diffusion between coating and substrate causes changes in microstructure, which destroy the creep resistance of the alloy. We compare low-temperature, high-activity aluminide and platinum-modified aluminide coatings on the single crystal, nickel-based alloys, RR3000, CMSX-4 and TMS75, and describe the evolution of the microstructure following exposure at 1100 °C. In particular, the precipitation of topologically close packed (TCP) phases varies with alloy composition. We suggest that the morphology of the precipitates may influence the rate of ingress of the coating into the substrate. For example, the alloy RR3000 forms the σ-phase, which has an excellent fit with the alloy {1 1 1} planes and can nucleate as very fine small precipitates. In contrast, the μ-phase formed in the alloy CMSX-4 forms much larger, more widely spaced, TCP phases which necessitate a longer diffusion path for the slow diffusing refractory elements of which they are principally composed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 396, Issues 1–2, 15 April 2005, Pages 231-239
نویسندگان
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