TY - JOUR
T1 - Comparative TEM study on as-cast ingot and nodular bainite of Cu-14.9%Sn alloy
AU - Wang, Zeng Jie
AU - Konno, Toyohiko J.
N1 - Funding Information:
We thank Professors H. Li and C. Ma in Beihang University for fruitful discussions and continuous encouragement. One of the authors (ZW) thanks China Scholarship Council for the support during her stay in IMR. We thank T. Takahashi and S. Sugiyama in IMR for preparing Cu–Sn alloys. Dr Y. Kodama and S. Gondai are appreciated for their help in FIB operation. Y. Murakami and K. Narita in Advanced Research Center of Metallic Glasses, IMR, are acknowledged for EPMA and EBSD operations.
PY - 2014/2/1
Y1 - 2014/2/1
N2 - We have investigated microstructure and orientation relationship (OR) of the α and δ phases in an as-cast ingot and nodular bainite of Cu-14.9 at.% Sn alloy by using transmission electron microscopy. Proeutectoid α grains and surrounding δ phase (prior β phase) possess well-defined (1 1 1)α//(1 1 0)δ, OR, that is, Kurdjumov-Sach (K-S) OR, while these two phases formed by eutectoid decomposition exhibit some deviation from K-S OR. On the other hand, the α and δ phases in nodular bainite exhibit (1 1 1)α//(1 1 0)δ, which is Nishiyama-Wassermann (N-W) OR, as well as K-S OR. The emergence and variations of these ORs between the α and δ phases have been interpreted from the viewpoints of (i) matching of interplanar spacing of {1 1 1}α, {1 1 0}β and {6 6 0}δ planes, (ii) minimum strain criteria based on the invariant line concept for K-S OR and (iii) correspondence of atomic positions in the relevant phases by employing the structural ledge concept for N-W OR.
AB - We have investigated microstructure and orientation relationship (OR) of the α and δ phases in an as-cast ingot and nodular bainite of Cu-14.9 at.% Sn alloy by using transmission electron microscopy. Proeutectoid α grains and surrounding δ phase (prior β phase) possess well-defined (1 1 1)α//(1 1 0)δ, OR, that is, Kurdjumov-Sach (K-S) OR, while these two phases formed by eutectoid decomposition exhibit some deviation from K-S OR. On the other hand, the α and δ phases in nodular bainite exhibit (1 1 1)α//(1 1 0)δ, which is Nishiyama-Wassermann (N-W) OR, as well as K-S OR. The emergence and variations of these ORs between the α and δ phases have been interpreted from the viewpoints of (i) matching of interplanar spacing of {1 1 1}α, {1 1 0}β and {6 6 0}δ planes, (ii) minimum strain criteria based on the invariant line concept for K-S OR and (iii) correspondence of atomic positions in the relevant phases by employing the structural ledge concept for N-W OR.
KW - copper-tin alloy
KW - orientation relationship
KW - phase transformation
KW - precipitation behaviour
KW - solidification
KW - transmission electron microscopy
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U2 - 10.1080/14786435.2013.853886
DO - 10.1080/14786435.2013.853886
M3 - Article
AN - SCOPUS:84892938992
SN - 1478-6435
VL - 94
SP - 420
EP - 438
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 4
ER -