TY - JOUR
T1 - Precipitation of nanosized nitrides in plasma nitrided Fe-M (M = Al, Cr, Ti, V) alloys
AU - Miyamoto, G.
AU - Tomio, Y.
AU - Aota, H.
AU - Oh-Ishi, K.
AU - Hono, K.
AU - Furuhara, T.
PY - 2011/4
Y1 - 2011/4
N2 - Nanosized alloy nitrides or alloying element (M)-Nitrogen(N) cluster formed in plasma nitriding of Fe-M binary alloys were investigated by means of high resolution TEM. Specimen surface of the Fe-Cr alloys was hardened by the formation of disk shaped CrN of NaCl structure, which is ∼2 nm thick and 10 nm in diameter. In nitrided Fe-Al specimen, two kinds of AlN nitrides of metastable NaCl type and stable wurtzite type were formed near the specimen surface. Both of these were much larger than CrN. Contrasting to these specimens, in nitrided Fe-Ti and Fe-V alloys, high density M-N clusters of few nanometres diameter, many of which were monolayered lying on {001} α, were formed, leading to larger hardness increase than that in Fe-Cr and Fe-Al alloys. The formation of M-N clusters in nitriding is explained by the thermodynamical analysis of phase separation between M/N poor and M/N rich bcc phases.
AB - Nanosized alloy nitrides or alloying element (M)-Nitrogen(N) cluster formed in plasma nitriding of Fe-M binary alloys were investigated by means of high resolution TEM. Specimen surface of the Fe-Cr alloys was hardened by the formation of disk shaped CrN of NaCl structure, which is ∼2 nm thick and 10 nm in diameter. In nitrided Fe-Al specimen, two kinds of AlN nitrides of metastable NaCl type and stable wurtzite type were formed near the specimen surface. Both of these were much larger than CrN. Contrasting to these specimens, in nitrided Fe-Ti and Fe-V alloys, high density M-N clusters of few nanometres diameter, many of which were monolayered lying on {001} α, were formed, leading to larger hardness increase than that in Fe-Cr and Fe-Al alloys. The formation of M-N clusters in nitriding is explained by the thermodynamical analysis of phase separation between M/N poor and M/N rich bcc phases.
KW - Metastable
KW - Nitriding
KW - Precipitation
KW - Steel
KW - Transmission electron microscopy
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U2 - 10.1179/1743284710Y.0000000014
DO - 10.1179/1743284710Y.0000000014
M3 - Article
AN - SCOPUS:79954535159
SN - 0267-0836
VL - 27
SP - 742
EP - 746
JO - Materials Science and Technology
JF - Materials Science and Technology
IS - 4
ER -