In Situ HRTEM Observation of Electron-Irradiation-Induced Amorphization and Dissolution of the E (Al18Cr2Mg3) Phase in 7475 Al Alloy

doi:10.1007/s40195-014-0176-6

Abstract

Abstract:

Electron irradiation effects on phase stability of the E (Al₁₈Cr₂Mg₃) phase have been investigated by high-angle annular dark-field scanning transmission electron microscopy and high-resolution transmission electron microscopy (HRTEM). The in situ HRTEM observations show that the Al₁₈Cr₂Mg₃ particles with different thickness undergo amorphization and dissolution under 300 keV electron irradiation at 25 °C. The results indicate that the intermetallic compound Al₁₈Cr₂Mg₃ is unstable under electron irradiation, and structural changes mainly depend on the thickness of particles. Amorphization in the thick particles is caused by a combination of chemical disordering and an increase in point defect concentration. Dissolution after amorphization in the thin particles is attributed to the diffusion of point defect towards the Al matrix.

Key words: Intermetallic compound, Al18Cr2Mg3, Irradiation effects, Amorphization Dissolution

Mao-Hua Li, Yan-Qing Yang, Bin Huang, Xian Luo, Wei Zhang, Yan-Xia Chen, Ming Han, Ji-Gang Ru. In Situ HRTEM Observation of Electron-Irradiation-Induced Amorphization and Dissolution of the E (Al₁₈Cr₂Mg₃) Phase in 7475 Al Alloy[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(2): 147-151.

Figures/Tables 4

Fig. 1 HAADF-STEM micrograph of Al18Cr2Mg3 particles in the 7475 Al alloy sample after solid solution treatment

Fig. 2 HRTEM micrographs sequence showing C-A transition in the thick Al18Cr2Mg3 particle by 300 keV electron irradiation (insets are the corresponding FFT spectra): a Before irradiation; b After 10 s irradiation; c After 20 s irradiation; d After 30 s irradiation

Fig. 3 HRTEM micrographs sequence showing dissolution in the thin Al18Cr2Mg3 particle by 300 keV electrons irradiation (insets are the corresponding FFT spectra): a before irradiation at low magnification; b magnifications of the white rectangular region in Fig. 3a before irradiation; c the same region of Fig. 3b after 10 s irradiation; d the same region of Fig. 3b after 20 s irradiation; e the same region of Fig. 3b after 30 s irradiation; f the same region of Fig. 3b after 50 s irradiation

Table 1 C-A transition in a variety of intermetallic compounds under electron irradiation [1-4]

Al₇Cr	Al₅Cr	Al₄Cr
Al₉Co₂	BCo₂	BCo₃	Co₂Ti
Al₁₀V	Al₄₅V₇	Al₂₃V₄
Al₆Mn	Al₄Mn	Mn₂TiFe₄
NiTi	NiTi₂	BNi₂	B₃Ni₄(o)	MoNi	Nb₇Ni₆	ZrAlNi
Cu₃Ti₂	Cu₄Ti₃	CuTi	CuTi₂	Cu₁₀Zr₇	CuZr	CuZr₂
Al₂Zr	Al₃Zr₂	AlZr	Al₄Zr₅	Al₃Zr₄	Al₂Zr₃	AlZr₂
Ni₃Zr	NiZr	NiZr₂	PdZr₂	Pt₃Zr₅	FeZr₂	FeZr₃	Cr₂Zr
Al₃Fe	BFe₃	Fe₂Ti	Fe₁₇Nd₂	Fe₂₃Nd₂B₃	Fe₁₄Nd₂B	Fe₈₁Zr₉B₁₀

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In Situ HRTEM Observation of Electron-Irradiation-Induced Amorphization and Dissolution of the E (Al₁₈Cr₂Mg₃) Phase in 7475 Al Alloy

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