快淬钐铁合金不同速率下的相结构演变
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摘要
在高真空电弧熔炼及单辊旋淬一体炉制备钐铁合金薄带实验中,通过控制辊轮转速来实现不同的冷却速率(10~5~10~6K·s~(-1))。在快速冷凝钐铁合金的过程中,由于存在非常高的温度梯度,落至辊轮上的合金液滴会迅速冷凝成连续的非晶或微晶薄带。通过XRD物相检测手段研究快淬钐铁合金不同速率下的相结构演变。结果表明:在常规冷却条件下凝固得到的钐铁合金中具有α-Fe,SmFe_3,SmFe_2和Sm_2Fe_(17)4种物相;在快速冷凝条件下,钐铁合金的α-Fe相消失,随着冷却速率增大,SmFe_3相也消失,合金中只剩下SmFe_2和Sm_2Fe_(17)相;冷却速率继续增大时,快淬钐铁中出现非晶,且随着冷却速率的增大,非晶含量增多;此外,当快淬速率升至36.5 m·s~(-1)时,非晶含量可达到50%左右。
The experiment of preparing Sm-Fe Alloys ribbons with high vacuum arc melting and melt spin ning furnace was performed with the different cooling rates(10~5~ 10~6 K·s~(-1)) which were realized by controlling roller speed.In the process of condensing Sm-Fe alloys rapidly,the alloy droplets falling on roller were rapidly condensed into continuous noncrystalline or microcrystalline ribbons due to the very high thermal gradient.The evolution of phase structure of rapidly quenched Sm-Fe alloys in different rates was researched by XRD phase testing technology.The results showed that the Sm-Fe alloys solidified in conventional chilling conditions had four phases of α-Fe,SmFe_3,SmFe_2 and Sm_2Fe_(17).The α-Fe phase of Sm-Fe alloys disappeared under the condition of rapid solidification,and the SmFe_3 phase also disappeared with increase of the cooling rate,and then the final phases of alloys only contained SmFe_2 and Sm_2Fe_(17).With further increasing the cooling rate,noncrystalline appeared in Sm-Fe alloys.Moreover,the content of noncrystalline could be up to 50% with rapidly quenching rate of 36.5 m·s-1.
The experiment of preparing Sm-Fe Alloys ribbons with high vacuum arc melting and melt spin ning furnace was performed with the different cooling rates(10~5~ 10~6 K·s~(-1)) which were realized by controlling roller speed.In the process of condensing Sm-Fe alloys rapidly,the alloy droplets falling on roller were rapidly condensed into continuous noncrystalline or microcrystalline ribbons due to the very high thermal gradient.The evolution of phase structure of rapidly quenched Sm-Fe alloys in different rates was researched by XRD phase testing technology.The results showed that the Sm-Fe alloys solidified in conventional chilling conditions had four phases of α-Fe,SmFe_3,SmFe_2 and Sm_2Fe_(17).The α-Fe phase of Sm-Fe alloys disappeared under the condition of rapid solidification,and the SmFe_3 phase also disappeared with increase of the cooling rate,and then the final phases of alloys only contained SmFe_2 and Sm_2Fe_(17).With further increasing the cooling rate,noncrystalline appeared in Sm-Fe alloys.Moreover,the content of noncrystalline could be up to 50% with rapidly quenching rate of 36.5 m·s-1.
引文
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