One-step consolidation and precipitation hardening of an ultrafine-grained Al-Zn-Mg alloy powder by Spark Plasma Sintering

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• 作者：H. Queudet^a ; ^b ; ^c ; ^{hippolyte.queudet@univ-lorraine.fr} ; S. Lemonnier^a ; E. Barraud^a ; J. Guyon^b ; J. Ghanbaja^c ; N. Allain^b ; E. Gaffet^c
• 关键词：Strengthening mechanism ; Al alloy ; Ultrafine grained materials ; Spark Plasma Sintering ; Mechanical properties ; High energy ball milling
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：8 February 2017
• 年：2017
• 卷：685
• 期：Complete
• 页码：227-234
• 全文大小：2228 K
• 卷排序：685

文摘

In the present work, ultrafine-grained Al-Zn-Mg alloy produced by high energy ball milling and Spark Plasma Sintering was synthesized. The Hall-Petch strengthening due to grain refinement (about 150 nm) is preserved and the Orowan's effect attributed to the presence of the hardening phase η’ is obtained in a single-step during the sintering. Maximum compression stresses as high as 736 MPa and 830 MPa were reached in quasistatic and dynamic conditions respectively. Hardness was increased from 124 HV5 for a consolidated coarse grained material to 196 HV for a consolidated ultrafine-grained (UFG) material. The mechanical properties obtained in this study were all superior to the ones of the reference AA7020-T651.