Mn-Al-C永磁合金相變動力學及τ相的穩定性
The Dynamics of Phase Transformation and Stability of r Phase for Mn-Al-C Alloy
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摘要: 本文研究了成分為Mn 69.40%、Al 29.86%、C0.58%3元合金的相變動力學和3種不同成分Mn-Al-C合金的恒溫轉變過程,還用示差熱分析法測定了合金在加熱過程中相變的臨界溫度。實驗結果表明:合金的恒溫轉變過程隨成分不同而變化,處于亞共析成分時,τ相分解先析出γ相;處于過共析成分時,τ相分解先析出β-Mn相。τ相的穩定性取決于Mn/C比,含碳量一定,隨Mn含量增加,τ相穩定性降低。必須使合金中的含碳量超過其在τ相內的溶解度極限,才能提高τ相的穩定性。Abstract: The dynamics of phase transformation of the ternary alloy which consists of 69.40wt% Mn, 29.86wt%Al, 0.58wt% C, and constant temperature for three types of Mn-Al-C have been researched.The critical temperature of base transformation of the alloys were measured by DTA.It indicated that the transformation temperature for these alloy varied with the different compositions.In the sub-eutectic composition, phase decomposed, γ-Phase precipitated first. But in over-eutectic composition,β-Mn phase precipitated from τ-phase.When the content of C was constant,the stability of τ-phase decreased with the increase of Mn content.
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