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| CRYOGENIC PROPERTIES AND PARAMAGNETISMANTIFERROMAGNETISM TRANSITION OF A γ-Fe-Mn-Al ALLOY |
| ZHANG Yansheng (Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 16 September; 1983; revised manuscript 21 December; 1983) |
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Cite this article:
ZHANG Yansheng (Institute of Metal Research; Academia Sinica; Shenyang)(Manuscript received 16 September; 1983; revised manuscript 21 December; 1983). CRYOGENIC PROPERTIES AND PARAMAGNETISMANTIFERROMAGNETISM TRANSITION OF A γ-Fe-Mn-Al ALLOY. Acta Metall Sin, 1984, 20(5): 313-321.
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Abstract Studies were made of the cryogenic properties, structural stability and magnetism transition of a fcc γ-Fe-Mn-Al alloy containing 25.6% Mn,4.1%Al, 0.16%C and 0.27%Si, of which the strength, ductility and austenitic stability are satisfactory at temperature range of 300 to 4 K. Its physical properties were determined as follows: lower magnetic susceptibility about 34.6×10~(-4) to 22×10~(-4) from 300 to 4 K; higher electric resistivity up to 105μΩ·cm and lower cold contraction than conventional Fe-Cr-Ni austenitic steels. A peak value is presented on the plot of temperature T dependence of magnetic susceptibility x at 320 K. The sign change of dx/dT shows the paramagnetism-antiferromagnetism transition at which an anomaly of several physical properties such as elastic modulus, heat expansion, etc. is accompanied. Furthermore, by an addition of Al to Fe-Mn alloy, its Néel temperature may be markedly lowered. The magnetic susceptibility may be increasing to a greater value at Néel temperature. In comparison with AISI 300 Cr-Ni austenitic stainless steels, the γ-Fe-Mn-Al alloy is characterized by both stable austenite and quite low magnetic susceptibility within temperature range down from 20 to 4 K. It seems to be a potential constructional material for superconducting magnet applications.
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Received: 18 May 1984
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