| Mechanical Properties of Rapidly Solidified Aluminium Alloys Extruded from Amorphous or Nanocrystalline Powders. (1998) | |||||||||
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| Amorphous powders of the al-ni-mm system and nanocrystalline powders of the al-ni-mm system (mm is defined as misch metal) were produced by a high-pressure gas atomization technique. following degassing, the powders were extruded with a reduction ratio of 10:1. tensile tests were performed for as-extruded alloys. high values of tensile strength and elastic modulus were obtained in both alloy systems. The maximum tensile strength reached was as high as 1000 mpa for an al-14.9ni-3.3mm-5.1zr alloy (where the composition is in weight percent). the structure of the al-ni-mm-zr alloys is a finely mixed structure consisting of fine intermetallic compounds of al(sub 3)Ni, al(sub 11)mm(sub 3) and al(sub 3)zr homogeneously embedded in an ultra-fine-grained aluminum matrix. the structure of the al-ni-mm-zr alloys is finer than that of al-ni-mm alloys because of the additional effect of zirconium. a hall-petch relationship was investigated for the al-ni-mm and al-ni-mm-zr alloys. both the grain size refinement of the aluminum matrix and the dispersion strengthening of intermetallic compounds are interpreted as contributing to the achievement of the ultra-high tensile strength. | |||||||||
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