TEM STUDY OF MODULATED STRUCTURE DURING INITIAL TRANSFORMATION IN Ni-Cu-x (x=Si, Cr) ALLOYS

Acta Metall Sin

1986, Vol. 22

Issue (6): 52-57 DOI:

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TEM STUDY OF MODULATED STRUCTURE DURING INITIAL TRANSFORMATION IN Ni-Cu-x (x=Si, Cr) ALLOYS

by JIANG Bohong (Shanghai Jiaotong University); W AGNER R. (GKSS-Forschungszentrum; D2054 Geesthacht; FRG)

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by JIANG Bohong (Shanghai Jiaotong University); W AGNER R. (GKSS-Forschungszentrum; D2054 Geesthacht; FRG). TEM STUDY OF MODULATED STRUCTURE DURING INITIAL TRANSFORMATION IN Ni-Cu-x (x=Si, Cr) ALLOYS. Acta Metall Sin, 1986, 22(6): 52-57.

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Abstract The modulated structure developed during early aging stage in Ni-38Cu-6Si and Ni-60Cu-4Cr (by at.-%) alloys have been studied by TEM in different operating conditions It has been shown that the features of wavy striation contrast in image and satellites in diffraction patterns were viewed in both Ni-Cu-Si and Ni-Cu-Cr alloys But the diserete particles distributed randomly with sharp interphase boundaries were detected in initial stages of aging by using the technique of defocussing high order reflection in bright field. However, they arrayed periodically along <100> direction after some aging time. Accordingly it is suggested that the modulated structure formed by aging at 580℃ in the two alloys is not due to spinodal decomposition The distinguishing criterions between spinodal reaction and nucleation-growth have been discussed.

Received: 18 June 1986

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1986/V22/I6/52

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