Table 1. Chemical compositions (in atomic percent) of the matrix and precipitate phases at selected temperatures during the CH5 treatment, as determined by APT.

Corresponding atom maps are provided in the supporting information, Figs. S3 and S4. The scattering length densities (SLDs) were calculated from the measured compositions and corresponding atomic densities.

		Chemical composition (at.%)
Condition	Phase	Ti	Al	Sn	Zr	Mo	Nb	Si	Cu	SLD (×10−6 Å−2)
600 °C	α/α′ phase	82.97 ± 0.04	11.83 ± 0.03	0.72 ± 0.1	1.62 ± 0.01	0.06 ± 0.01	1.62 ± 0.01	0.47 ± 0.01	0.65 ± 0.01	34.66
	Ti2Cu	69.13 ± 0.05	2.22 ± 0.01	0.12 ± 0.01	2.82 ± 0.01	0.07 ± 0.01	0.66 ± 0.01	0.44 ± 0.01	24.49 ± 0.04	42.13
700 °C	α phase	82.9 ± 0.09	11.27 ± 0.07	0.7 ± 0.02	1.49 ± 0.03	0.05 ± 0.02	1.96 ± 0.03	0.38 ± 0.02	0.79 ± 0.02	35.02
	Ti2Cu	71.69 ± 0.08	2.71 ± 0.03	0.11 ± 0.01	2.57 ± 0.03	0.05 ± 0.01	0.81 ± 0.01	0.21 ± 0.01	22.39 ± 0.07	42.04
	(Ti,Zr)6Si3	34.82 ± 0.65	1.55 ± 0.17	1.88 ± 0.19	20.45 ± 0.54	0.41 ± 0.09	1.53 ± 0.21	38.57 ± 0.66	0.44 ± 0.11	36.67