Effects of copper addition on cryogenic tensile properties of an Al-4.4%Zn-1.4%mg alloy.
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Tensile properties at 77 and 4.2K have been studied in Al-4.4%Zn-1.4%Mg alloys containing copper up to 1.5% both in under-aged and over-aged conditions. The ductility at a fixed strength level was significantly improved by the copper addition at both temperatures under both aging conditions. Fractographic observations revealed that the fraction of intergranular fracture decreased with increasing copper content, and that intergranular fracture surface consisted of ledges instead of micro-dimples. According to TEM and SEM observations after deformation, intense slip bands were seen in the copper-free alloy while the distribution of slip bands was relatively uniform in the copper-containing alloys. Microstructures adjacent to grain boundaries were also examined, but were considered to exert a minor effect. Thus the ductility improvement by the copper addition, connected with the suppression of intergranular fracture, was ascribed to the reduction in the stress concentration at the grain boundaries through the uniform distribution of slip bands.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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