Rare Earth Metal-Based Intermetallics Formation in Al–Cu–Mg and Al–Si–Cu–Mg Alloys: A Metallographic Study

Table 2

WDS analysis of the RE-based phases observed in the alloys studied.

Alloy code	Phase/color	Element (at.%)									Suggested formula
		Al	Ti	Fe	Cu	Mg	Cr	Si	Ce	La
D0 + 5 wt.%La (with Ti)	1 white	33.13	0.000	0.021	0.269	0.000	0.121	30.26	1.819	34.31	AlLaSi
	2 white	34.56	0.000	0.000	0.426	0.000	0.118	27.51	1.955	35.37	AlLaSi
	3 white	35.03	0.000	0.000	0.343	0.000	0.102	27.63	1.833	35.01	AlLaSi
	4 white	36.57	0.000	0.000	0.290	0.000	0.132	25.93	1.807	35.23	AlLaSi
	5 white	34.72	0.000	0.006	0.344	0.000	0.076	27.82	1.775	35.20	AlLaSi
	6 white	50.11	0.000	0.000	0.083	0.938	0.028	26.49	1.379	20.95	Al2LaSi
	7 white	45.61	0.000	0.017	8.933	0.674	0.077	22.79	1.133	20.53	Al9La4Cu2Si4
	1 grey	85.74	6.676	0.013	0.469	1.541	0.183	0.801	0.581	3.815	Al21Ti2La
	2 grey	85.39	6.543	0.035	0.606	1.570	0.279	0.919	0.626	3.767	Al21Ti2La
	3 grey	85.48	6.343	0.046	0.707	1.307	0.346	0.888	0.567	3.764	Al21Ti2La
	4 grey	85.20	6.439	0.013	0.588	1.737	0.289	1.033	0.597	3.832	Al21Ti2La
	5 grey	85.33	6.588	0.008	0.691	1.264	0.238	1.262	0.525	3.846	Al21Ti2La
D0 + 5 wt.%La (without Ti)	1 white	33.07	0.000	0.000	0.272	0.000	0.136	29.68	0.358	36.44	AlLaSi
	2 white	31.65	0.000	0.000	0.512	0.000	0.144	30.71	0.406	36.54	AlLaSi
	3 white	31.57	0.000	0.031	0.463	0.033	0.093	30.20	0.341	37.18	AlLaSi
	4 white	31.46	0.000	0.000	0.513	0.000	0.133	30.07	0.413	37.32	AlLaSi
	5 white	32.24	0.000	0.000	0.397	0.000	0.131	29.72	0.380	37.09	AlLaSi
	1 grey	84.70	7.469	0.006	0.417	1.098	0.112	1.667	0.102	4.253	Al21Ti2La
	2 grey	84.62	7.388	0.001	0.546	1.063	0.134	1.645	0.109	4.286	Al21Ti2La (with traces of Si and Cu)
	3 grey	84.47	7.417	0.022	0.684	1.092	0.112	1.546	0.086	4.340	Al21Ti2La
	4 grey	84.45	7.357	0.011	0.995	0.959	0.120	1.480	0.092	4.281	Al21Ti2La
	5 grey	84.69	7.528	0.000	0.561	1.412	0.118	1.162	0.097	4.264	Al21Ti2La
D0 + 5 wt.%Ce (with Ti)	1 white	51.26	0.000	0.000	0.073	0.416	0.001	25.64	21.82	0.710	Al2CeSi
	2 white	45.37	0.000	0.000	0.276	0.391	0.011	28.55	24.59	0.803	Al2CeSi
	3 white	45.49	0.000	0.017	0.292	0.358	0.022	28.42	24.56	0.838	Al2CeSi
	4 white	45.15	0.000	0.014	0.259	0.331	0.000	29.20	24.20	0.810	Al2CeSi
	5 white	51.86	0.000	0.009	0.077	0.480	0.023	25.33	21.46	0.727	Al2CeSi
	1 grey	85.78	6.314	0.014	1.080	0.561	0.104	1.388	4.156	0.042	Al21Ti2Ce
	2 grey	85.40	6.228	0.015	1.410	0.650	0.087	1.431	4.134	0.055	Al21Ti2Ce
	3 grey	84.52	6.255	0.019	1.777	0.548	0.107	1.869	4.265	0.038	Al21Ti2Ce
	4 grey	83.99	6.394	0.008	2.558	0.586	0.087	1.601	4.187	0.042	Al21Ti2Ce
	5 grey	85.53	6.377	0.015	0.946	0.544	0.100	1.659	4.272	0.042	Al21Ti2Ce (with traces of Si and Cu)
B0 + 5 wt.%La (with Ti)	1 white	56.46	0.000	2.598	14.97	0.023	0.050	9.812	0.119	15.83	Al11La3(Cu,Fe)4Si2
	2 white	59.69	0.000	2.384	14.42	0.220	0.020	9.076	0.123	13.97	Al11La3(Cu,Fe)4Si2
	3 white	56.64	0.000	2.942	14.43	0.036	0.031	10.12	0.080	15.61	Al11La3(Cu,Fe)4Si2
	4 white	46.52	0.000	0.000	3.426	0.000	0.064	18.30	0.145	31.44	Al5La3Si2
	5 white	56.33	0.000	2.686	15.70	0.067	0.058	9.508	0.120	15.45	Al6La2(Cu,Fe)2Si
	6 white	50.39	0.000	0.000	2.654	0.061	0.099	18.09	0.093	28.52	Al3La (with traces of Cu, Si, and Fe)
	7 white	84.75	7.215	0.014	0.374	2.236	0.172	0.358	0.046	4.343	Al3La (with traces of Cu, Si, and Fe)
	8 white	82.26	6.420	0.053	1.293	3.494	0.247	0.579	0.067	4.351	Al3La (with traces of Cu, Si, and Fe)
	1 grey	84.27	7.317	0.013	0.344	2.726	0.146	0.496	0.038	4.330	Al21Ti2La (with traces of Cu, Si, Fe)
	2 grey	85.22	7.428	0.009	0.258	1.983	0.090	0.333	0.075	4.320	Al21Ti2La (with traces of Cu, Si, and Fe)
	3 grey	84.32	7.730	0.012	0.451	2.099	0.140	0.408	0.019	4.384	Al21Ti2La (with traces of Cu, Si, and Fe)
B0 + 5 wt.%Ce (with Ti)	1 white	42.15	0.000	0.121	1.428	0.000	0.000	22.34	33.90	0.000	Al4Ce3Si2
	2 white	55.71	0.000	2.833	15.79	0.000	0.008	10.00	15.64	0.000	Al11Ce3(Cu,Fe)4Si2
	3 white	41.46	0.522	0.105	1.367	0.000	0.032	23.12	33.33	0.000	Al4Ce3Si2
	4 white	55.04	0.000	2.782	16.32	0.000	0.000	10.82	14.98	0.002	Al11Ce3(Cu,Fe)4Si2
	5 white	44.12	0.000	0.053	0.913	0.000	0.005	22.49	32.38	0.000	Al4Ce3Si2
	6 white	85.92	8.113	0.000	0.261	0.568	0.017	0.871	4.205	0.000	Al4Ce3Si2
	7 white	86.83	7.153	0.010	0.327	0.820	0.018	0.515	4.247	0.000	Al4Ce3Si2
	1 grey	87.19	7.178	0.002	0.348	0.383	0.030	0.619	4.219	0.002	Al21Ti2Ce (with traces of Cu, Fe, Mg, and Si)
	2 grey	87.00	7.292	0.007	0.336	0.447	0.034	0.609	4.193	0.008	Al21Ti2Ce (with traces of Cu, Fe, Mg, and Si)
	3 grey	86.75	7.256	0.019	0.427	0.441	0.018	0.810	4.241	0.000	Al21Ti2Ce (with traces of Cu, Fe, Mg, and Si)