標題: PHASE-TRANSFORMATION IN AN FE-9.0AL-29.5MN-1.2SI ALLOY
作者: LIU, TF
UEN, GC
CHAO, CY
LIN, YL
WU, CC
機械工程學系
材料科學與工程學系
Department of Mechanical Engineering
Department of Materials Science and Engineering
公開日期: 1-Jun-1991
摘要: The microstructure of an (alpha + gamma) duplex Fe-9.0Al-29.5Mn-1.2Si alloy has been investigated by means of transmission electron microscopy. In the as-quenched condition, extremely fine D0(3) particles were formed within the ferrite matrix by a continuous ordering transition during quenching. After being aged at 550-degrees-C, the extremely fine D0(3) particles existing in the as-quenched specimen grew preferentially along [100] directions. With increasing the aging time at 550-degrees-C, a (Si, Mn)-rich phase (designated as "L phase") began to appear at the regions contiguous to the D0(3) particles. The L phase has never been observed in various Fe-Al-Mn, Fe-Al-Si, Fe-Mn-Si, and Mn-Al-Si alloy systems before. When the as-quenched specimen was aged at temperatures ranging from 550-degrees-C to 950-degrees-C, the phase transformation sequence occurring within the (alpha + D0(3)) region as the aging temperature increases was found to be (alpha + D0(3) + L phase) --> (alpha + D0(3) + A13 beta-Mn) --> (B2 + D0(3) + A13 beta-Mn) --> (B2 + A13 beta-Mn) --> (alpha + A13 beta-Mn) --> (alpha + gamma) --> alpha.
URI: http://dx.doi.org/10.1007/BF02660672
http://hdl.handle.net/11536/3766
ISSN: 0360-2133
DOI: 10.1007/BF02660672
期刊: METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume: 22
Issue: 6
起始頁: 1407
結束頁: 1415
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