J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (3): 396-401.DOI: 10.1016/j.jmst.2018.09.032
• Research Article • Previous Articles Next Articles
Fangyu Qina, Wenlong Xiaoa, Fengshuang Lub, Yuanchao Jic, Xinqing Zhaoa*(), Xiaobing Renc
Received:
2018-07-21
Revised:
2018-08-17
Accepted:
2018-08-30
Online:
2019-03-15
Published:
2019-01-18
Contact:
Zhao Xinqing
About author:
1 These authors contributed equally to this work.
Fangyu Qin, Wenlong Xiao, Fengshuang Lu, Yuanchao Ji, Xinqing Zhao, Xiaobing Ren. Resolution of a discrepancy of magnetic mechanism for Elinvar anomaly in Fe-Ni based alloys[J]. J. Mater. Sci. Technol., 2019, 35(3): 396-401.
Fe | Ni | Cr | Ti | Al | Si | Mn |
---|---|---|---|---|---|---|
48.80 | 41.54 | 5.48 | 2.50 | 0.66 | 0.53 | 0.49 |
Table 1 Chemical compositions of Ni-Span C (mass %).
Fe | Ni | Cr | Ti | Al | Si | Mn |
---|---|---|---|---|---|---|
48.80 | 41.54 | 5.48 | 2.50 | 0.66 | 0.53 | 0.49 |
Fig. 1. Magnetic moment vs. temperature (M-T) curve and temperature dependency of storage modulus of Ni-Span C during cooling process. TC is the Curie temperature at which the paramagnetic-ferromagnetic transition occurs. Tm corresponds to the gentle inflection of magnetic moment in M-T curve. The dotted line refers to the modulus simulated by Wachtman’s Equation. Tsm represents the inflection temperature of the storage modulus vs. temperature curve.
Fig. 2. In situ XRD patterns at 173?K (a), 298?K (b), 473?K (c) of Ni-Span C and DSC curve (d), indicating invariant average structure over a broad temperature range.
Fig. 3. TEM and HRTEM images of Ni-Span C at 298?K: (a) dark field image obtained by using additional reflection marked by yellow arrow; (b) HRTEM image of square area in Fig. 3(a); (c) IFFT image of Fig. 3(b), in which the outlined regions indicate the modulated nanodomains.
Fig. 4. DMA curve of Ni-Span C on heating process, in which the insets show the enlarged storage modulus dip temperatures (Tg) and the frequency dependence of Tg that follows Vogel-Fulcher relation.
Fig. 5. HRTEM images, schematics of SAED patterns and ball-and-stick model illustrating BCT structure of nanodomains: (a-d) HRTEM micrographs of Ni-Span C at 503?K, 363?K, 293?K and 183?K, respectively, in which the corresponding diffraction patterns are shown in each inset and the nanodomains are outlined by yellow dotted lines; (e, f) schematic SAED patterns with incident beam parallel to [1ˉ12]FCC and [001]FCC respectively, indicating FCT structured nanodomains with three variants. The double diffraction spots are attributed to the diffraction beam traveling through the overlapped nanodomains and matrix; (g) ball-and-stick model demonstrating the relationship between the FCT and BCT lattice structure, by which the nanodomains are determined to be with BCT structure.
Fig. 6. Schematics illustrating mechanism of Elinvar anomaly (a) and evolution of nanodomains during strain glass transition (b) in Ni-Span C. Tnd refers to the starting temperature for the appearance of precursory nanodomains. The pictures marked by I, II, III and IV in Fig. 6(b) represent the microstructures of the Elinvar alloy at corresponding stages in Fig. 6(a).
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