Transmission electron microscopy has been used to study δ′ (Al3Li) precipitation in Al–7·8, 10·7, and 12·9 at.-%Li alloys. The δ′ ageing behaviour in the vicinity of its solvus has been accounted for by the presence of a hitherto unreported coherent phase boundary. Both this boundary position and the δ′ solvus have been defined. In all alloys the low misfit δ′ invariably forms during the quench from the solution treatment temperature, and its coarsening characteristics in the temperature range 140–200°C have been described.
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References
1.
NobleB. E. and ThompsonG. E., Metal Sc L J., 1971, 5, 114.
2.
WilliamsD. B. and EdingtonJ. W., Phil. Mag., 1974,30, 1147.
3.
WilliamsD. B., PhD Thesis, Univ. Cambridge, 1974.
4.
SilcockJ. M., J. Inst. Metals, 1959 –60, 88, 357.
5.
AshbyM. F. and BrownL. M., Phil. Mag., 1963, 8, 1083.
6.
NowakS. K., Trans. Amer. Inst. Min. Met. Eng., 1956, 206, 553.
7.
JonesW. R. D. and DasP. P., J. Inst. Metals, 1958 –59, 87, 338.
8.
AngermanC. L., J. Nuclear Mat., 1964, 11, 41.
9.
HargreavesM. E., Acta Cryst., 1951, 4, 301.
10.
DanielV. and LipsonH., Proc. Roy. Soc., 1943, 181, 368.
11.
ParkerB. A. and WestD. R. F., J. Australian Inst. Metals, 1969, 14, 102.
