Modification of eutectic silicon and β-Al5FeSi phases in as-cast ADC12 alloys by using samarium addition
来源期刊：JOURNAL OF RARE EARTHS2013年第9期
论文作者：饶远生 闫洪 胡志
文章页码：916 - 922
摘 要：The effects of Sm additions（0,0.5 wt.%,1.0 wt.% and 1.5 wt.%） on the eutectic Si and β-Al5 FeSi phases of ADC12 as-cast alloys were studied by optical microscopy（OM）,scanning electron microscopy（SEM） and differential thermal analysis（DTA）.The experimental results showed that Sm was an effective modifying agent for the eutectic Si of ADC12 alloy,when 1.0 wt.%- 1.5 wt.% Sm was added to the alloy,the coarse acicular eutectic Si was modified into fine particle or short rod structure.Moreover,the appropriate addition of Sm（about 1.0 wt.%） had marked effects on shortening the length of needle-like β-Al5 FeSi phase.Whereas,Sm was less effective on modifying the needle-like β-iron to the Chinese script or spherical α-iron phase.The modification mechanism was also discussed.
饶远生1，闫洪1，胡志1,2
1. Institute of Advanced Forming,Nanchang University2. Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials,Jiangxi Academy of Sciences
摘 要：The effects of Sm additions（0,0.5 wt.%,1.0 wt.% and 1.5 wt.%） on the eutectic Si and β-Al5 FeSi phases of ADC12 as-cast alloys were studied by optical microscopy（OM）,scanning electron microscopy（SEM） and differential thermal analysis（DTA）.The experimental results showed that Sm was an effective modifying agent for the eutectic Si of ADC12 alloy,when 1.0 wt.%- 1.5 wt.% Sm was added to the alloy,the coarse acicular eutectic Si was modified into fine particle or short rod structure.Moreover,the appropriate addition of Sm（about 1.0 wt.%） had marked effects on shortening the length of needle-like β-Al5 FeSi phase.Whereas,Sm was less effective on modifying the needle-like β-iron to the Chinese script or spherical α-iron phase.The modification mechanism was also discussed.
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