本論文針對成分為Fe- 37 wt% Mn-9.9 wt% Al-0.03 wt% C的高錳含量鐵-錳-鋁合金的相變化情形作為研究方向。合金的熱處理方式為先經1300℃或1050℃高溫熱處理後，再經低溫的時效處理。當合金經上述之高溫熱處理後分析，合金於1300℃為BCC的單一相區域，而於1050℃為BCC+FCC的雙相組成區域。
合金經1300℃熱處理及低溫時效，發現有FCC、β-Mn、α-Mn及 D03相於BCC晶粒內出現。FCC相於所有溫度的時效處理均於BCC晶粒內析出成長，且此沃斯田體相以費德曼結構的析出方式於肥粒體相基地中出現，且析出成長時與BCC基地保持有K-S方向關係。β-Mn相存在的溫度範圍，上限介於900℃至800℃之間，而下限介於600℃至500℃之間。α-Mn及 D03是於500℃的時效處理條件，於BCC晶粒內被發現，α-Mn為立方晶，其晶格常數為BCC基地相的3倍，且與BCC晶粒有立方對立方的方向關係；D03則於殘留的BCC晶粒內，以整合型式地分佈於基地內。
合金經1050℃熱處理及低溫時效，於BCC晶粒內發現有FCC、β-Mn、α-Mn及D03相的析出；其中沃斯田體相以費德曼結構析出於肥粒體相基地中，且亦與基地具有K-S方向關係之析出成長。β-Mn相存在的上限溫度於900℃至800℃，而於500℃的時效亦發現其存在。α-Mn相存在的上限溫度介於600℃至500℃之間。D03於500℃時效，發現於BCC晶粒內以整合型式析出於基地內。

The Fe-Mn-Al alloy with compositions of Fe-37 wt% Mn-9.9 wt% Al-0.03 wt% C were studies throughout the quenching and aging process. After the specimens were heated at 1300℃ for 1/2 h and 1050℃ for 1 h, and then quenched in room temperature water, both alloys have a small amount of austenite distributed randomly along the ferrite grain boundary.
Transmission Electron Microscope (TEM), X-Ray Diffractometer (XRD) and Optical Microscope (OM) were used to make the qualitative analysis.
Performing the aging processes at low temperatures, after the solution heat treatment, we found FCC, β-Mn, α-Mn, and D03 phase precipitated in the BCC grains. After the aging processes at 900℃, we found K-S orientation relationship between the FCC precipitate and the BCC matrix. We found the temperature for the existence of β-Mn is between 900 and 600℃ and α-Mn precipitated below 600℃. Furthermore, we observed β-Mn and α-Mn can exist at 500℃. D03 was observed by the TEM study after aging at 500℃. The upper limit for the precipitation of the D03 phase is around 500℃.

1. X.J. Liu, S.M. Hao, L.Y. Xu, Y.F. Olio, and H. Chen, Metall. Trans. A, 27A, 2429 (1996).
2. 劉增豐，“鐵-9.1鋁-29.9錳-2.9鉻合金相變化”，國立清華大學，博士論文 (1985)。
3. 江憲瑩，“鐵-35錳-9鋁-低碳合金之相變化研究”，國立台灣科技大學碩士論文 (2004)。
4. D.A. Porter, and K.E. Eastering, Phase Transformations in Metals and Alloys, 2nd ed. (1992).
5. H. Warlimont, Order-Disorder Transformation in Alloys, 58 (1974).
6. W.C. Cheng, Chia-Fu Liu, Yi-Fan Lai, Scripta Metall., 48, 295 (2003).
7. 李文彬，“雙相鐵錳鋁碳合金麻田散鐵相變化研究”，國立清華大學，博士論文 (1997)。
8. 朱鴻源，“雙相鐵錳鋁碳合金麻田散鐵相變化研究”，國立清華大學，博士論文 (1994)。
9. T.F. Liu, and C.M. Wan, Scripta Metall., 19, 727 (1985).
10. T.F. Liu, and C.M. Wan, Scripta Metall., 19, 805 (1985).
11. T.F. Liu, and J.C. Tasy, Scripta Metall., 21, 1213 (1987).
12. W.S. Yang, T. B. Wu, and C.M. Wan, Scripta Metall., 24, 895 (1990).
13. K.H. Hwang, S.K. Chen, W.S. Yang, T.B. Wu, C.M. Wan, and J.G. Byrne, Scripta Metall., 24, 495 (1990).
14. S.K. Chen, K.H. Hwang, C.M. Wan, and J.G. Byrne, Scripta Metall, 24, 151 (1990).
15. W.S. Yang, T. B. Wu, and C. M. Wan, Scripta Metall., 24,895 (1990).
16. K.H. Hwang, S.K. Chen, W.S. Yang, T.B. Wu, C.M. Wan, and J.G. Byrne, Scripta Metall., 24, 495 (1990).
17. K.H. Hwang, C.M. Wan, and J.G. Byrne, Mat. Sci. and Eng.A, 132, 161 (1991).
18. D.J. Schmatz, Trans. AIME, 215, 112 (1959).
19. H.I. Aaronson, The Decomposition of Austenite by Diffusion Processes, Interscience, New York, 387 (1962).
20. H.I. Aaronson, C. Laird, and K.R. Kinsman, Phase Transformation, ASM., Metal Park, Ohio, and Chapman 8 Hall, Landon,313 (1970).
21. H. Hu, and C.S. Smith, Acta. Met. 4, 638 (1969).
22. R.B. Nicholson, Interfaces Conference (ed. R.C. Gifkins), Butterworths, London, 139 (1969).
23. D.M. Schwartz, and B.P. Ralph, Mag. 19, 1069 (1969).
24. D.M. Schwartz, and B.P. Ralph, Met. Sci., l3, 216 (1969).
25. A.F. Smith, Acta Met., 15, 1867 (1967).
26. C.S. Smith, Metal Interfaces, ASM., Metals Park, Ohio, 65 (1952).
27. J.W. Martin, and R.D. Doherty, Stability of Microstructure in Metallic Systems, 198 (1980).
28. W.C. Cheng, C.F. Liu, H.Y. Lin, Mat. Sci. and Eng. A, 335, 82 (2002).