超高圧力溶体化処理Al-Li合金固溶体の体積弾性率

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Al-Li alloys are well known as the materials of low density and high elastic modulus characteristics. We determined the high-pressure phase diagram at 5.4 GPa, and measured the some mechanical properties of resultant supersaturated solid solutions, and observed the interesting elastic behavior, i. e., the bulk modulus decreased with increase of lithium content, in spite of increasing Young's modulus and shear modulus. In order to clarify this property, the compressibilities of the Al-Li super satulated solid solutions (Al-5, 10, 15 mol% Li, prepared by high-pressure processing)were measured using MAX80, the high-pressure X-ray diffraction device set up at the synchrotron radiation beam line at the National Laboratory for High Energy Physics (KEK). The obtained pressure-volume relations were fitted to Birch's equation of state, thus calculated bulk modulus were certainly lower than those of pure Al at a reduction of about 0.6 GPa/mol% Li. On the other hand, the increases of Young's modulus and the shear modulus had been observed in our previous work. Then, the temperature dependencies of elastic constants for those supersatulated solid solutions were measured, and it was found that the trend of variations of elastic modulus against the lithium concentration was maintained in the temperature range of 5 to 290 K. Thus the attractive relationship between the bulk modulus and the Young's modulus was found to be intrinsic.
社団法人日本機械学会の論文
1993-12-25

超高圧力溶体化処理Al-Li合金固溶体の体積弾性率

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