Atom-probe tomographic study of gamma/gamma ' interfaces and compositions in an aged Co-Al-W superalloy

作者：Bocchini Peter J^*; Lass Eric A; Moon Kil Won; Williams Maureen E; Campbell Carelyn E; Kattner Ursula R; Dunand David C; Seidman David N

来源：Scripta Materialia, 2013, 68(8): 563-566.

DOI：10.1016/j.scriptamat.2012.11.035

• Cobalt alloys
• Superalloy
• Atom-probe tomography
• Intermetallic compounds
• Interfaces

Atom-probe tomography (APT) is utilized to investigate, in a Co-9.7Al-10.8W at.% alloy aged at 900 degrees C for similar to 1000 h, the phase compositions and partitioning behavior of the two-phase gamma(face-centered cubic)/gamma'(L1(2)) microstructure. The APT composition of the gamma-matrix (Co-8.97Al-5.69W at.%) agrees well with a previously reported measurement made by energy-dispersive X-ray spectroscopy; however, the composition of the gamma'(L1(2)) precipitates (Co-10.03Al-12.48W at.%) is slightly richer in W and Al, and leaner in Co. Partitioning coefficients and Al interfacial excesses are also calculated.

• 出版日期2013-4
• 单位西北大学