首页|Achieving Twin Strengthening in Bulk Aluminum via Adding Nanoparticles Combined with Tailoring Hot Pressing Temperature
Achieving Twin Strengthening in Bulk Aluminum via Adding Nanoparticles Combined with Tailoring Hot Pressing Temperature
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It is extremely difficult to strengthen bulk aluminum(Al)by twins,due to its high stacking fault energy under standard loading conditions.In this study,a simple yet effective solution was proposed for introducing twins to strengthen bulk Al.The method involves the addition of nanoparticles with high volume fraction combined with the tailoring of sintering temperature toward the melting point of Al during hot pressing.Sintering temperature plays an important role in forming twins in bulk Al containing high content nanoparticles.The twin content increases with increasing sintering temperature in the range of 590-640 ℃.At sintering temperature of 640 ℃,the twin content reaches 17％,enabling the significant improvement in the yield strength of the bulk Al from 251 to 400 MPa,compared with the sample with few or no twins.The twin strengthening may serve as a major strengthening mechanism for bulk Al,and its strengthening contribution is comparable to the dominant Orowan strengthening resulting from the added nanoparticles.
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