材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
Al-1 mass% Mg2Si合金における粒界析出物の透過電子顕微鏡観察
池野 進上乗 正信石動 正和松田 健二多々 静夫上谷 保裕
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1993 年 42 巻 479 号 p. 949-954

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The crystal structure of grain boundary precipitates in an Al-1 mass% Mg2Si alloy was investigated by transmission electron microscopy.
At a peak aged condition where the intergranular fracture occurs, the diffraction pattern of hexagonal system can be obtained from the grain boundary precipitates. These precipitates may be considered as an intermediate phase from comparing the diffraction patterns with matrix precipitates. The grain boundary precipitates have the preferential orientation relationship with the matrix as {001}m||{0001}p. The equilibrium precipitate (Mg2Si) is scarcely observed at the grain boundaries.
The number of grain boundary precipitates decreases with increasing the misorientation of grain boundary, while the mean size of grain boundary precipitates increases with increasing misorientation.

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