Microstructure, mechanical properties and creep of magnesium alloy Elektron21 reinforced with AlN nanoparticles by ultrasound-assisted stirring

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• 作者：Lydia Katsarou^a ; Maher Mounib^b ; Williams Lefebvre^b ; Sergey Vorozhtsov^c ; Matteo Pavese^d ; Claudio Badini^d ; Jon Mikel Molina-Aldareguia^e ; Carmen Cepeda Jimenez^e ; Maria Teresa Pé ; rez Prado^e ; Hajo Dieringa^a ; ^{hajo.dieringa@hzg.de" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Metal matrix composites ; Elektron21 ; AlN ; Creep ; Mechanical properties ; Ultrasound-assisted casting
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：6 April 2016
• 年：2016
• 卷：659
• 期：Complete
• 页码：84-92
• 全文大小：2953 K

文摘

Ceramic AlN nanoparticles were added to a melt of magnesium alloy Elektron21 assisted by mechanical stirring and sonication for deagglomeration. The produced nanocomposite was investigated to determine its metallography, hardness, physical and mechanical properties, and compression creep resistance. Creep tests at a constant temperature of 240 °C and constant stresses of between 70 and 200 MPa revealed an improvement in creep strength after the addition of 1 wt% of AlN nanoparticles. Minimum creep rates were determined and stress exponents were calculated. In order to determine the rate-controlling deformation mechanisms, the concept of a threshold stress for particle strengthened alloys was applied. True stress exponents were calculated for the alloy and for the composite.