Al-Fe共晶合金の一方向凝固組織と機械的性質
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Al-2.7wt%Fe and Al-3.25wt%Fe alloys were unidirectionally solidifed where the temperature gradient G and solidification rate R were controlled and uncotrolled, respectively. The Al-2.7wt%Fe alloy has three types of structures i. e. platelet eutectic, mixture of platelet and fibrous eutectics and flaky eutectic having primary α corresponding to G and R. The interphase spacing λ of FeAl3 is: Rλ2 = 5.8 × 10-3 (cm3/sec). The structure of the Al-3.25wt%Fe alloy changes from Al-FeAl6 eutectic cells including primary FeAl3 with α hallo to those including Al-FeAl3 eutectic and finally to Al-FeAl3 eutectic with primary FeAl3, corresponding to decrease in G, R and G/R. The spacing λ of regular rod-type FeAl6 is expressed as Rλ2 = 2.5 × 10-10 (cm3/sec). Transition from Al-FeAl3 to Al-FeAl6 eutectic occurs within a range of R from 2.6×10-2 to 4.6×10-2cm/sec (G less than 9°C/cm). The Al-FeAl3 alloy solidified at R from 1 × 10-3 to 2×10-3cm/sec has maximum tensile strength. The micro-hardness of the Al-FeAl6 eutectic increases with decrease in λ.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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