| 摘要 |
A process for producing a high strength and high toughness aluminum alloy comprises a first step of preparing an alloy material which has a primary metallographic structure with a volume fraction Vf of a single-phase structure of at least 90%, said single-phase structure is comprised of crystal particles having a particle size of less than 30 nm and an fcc structure (face-centered cubic structure), the alloy having a composition represented by a chemical formula: Al a T b Xc wherein T is at least one element selected from a first group including Y, La, Ce, Mm (misch metal) and Ca; X is at least one element selected from a second group including Fe, Co and Ni (but at least one element of Co and Ni, if only Y is selected from the first group); and each of a, b and c represents an atom %, with the proviso that 85</=a</=97, 1</=b</=10, and 2</=c</=15, and a second step of subjecting the alloy material to a thermal treatment at a temperature in a range +/-100 DEG C. of the temperature of destruction of the single-phase structure to destroy the single-phase structure, thereby providing a second metallographic structure having a combined structure in which an intermetallic compound is uniformly dispersed in a matrix comprised of crystal particles having a particle size of at most 400 nm. This makes it possible to produce an aluminum alloy enhanced not only in strength and toughness at ambient temperature, but also at increased temperatures.
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