Ultralow-temperature superplasticity and its novel mechanism in ultrafine-grained Al alloys

被引：32

作者：

Chinh, Nguyen Q. ^{[1
]}

Murashkin, Maxim Yu ^{[2
,3
]}

Bobruk, Elena, V ^{[2
,3
]}

Labar, Janos L. ^{[1
]}

Gubicza, Jeno ^{[1
]}

Kovacs, Zsolt ^{[1
]}

Ahmed, Anwar Q. ^{[1
]}

Maier-Kiener, Verena ^{[4
]}

Valiev, Ruslan Z. ^{[2
,3
]}

机构：

[1] Eotvos Lorand Univ, Dept Mat Phys, Budapest, Hungary

[2] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa, Russia

[3] St Petersburg State Univ, Lab Mech Bulk Nanomat, St Petersburg, Russia

[4] Leoben Univ, Dept Phys Met & Mat Testing, Leoben, Austria

来源：

MATERIALS RESEARCH LETTERS | 2021年 / 9卷 / 11期

基金：

俄罗斯基础研究基金会;

关键词：

Ultralow-temperature superplasticity; aluminum alloys; ultrafine-grained materials; severe plastic deformation; high-pressure torsion; ROOM-TEMPERATURE; ALUMINUM-ALLOYS; MG; BEHAVIOR; SC; DEFORMATION; SEGREGATION; BOUNDARIES; DIFFUSION; DUCTILITY;

D O I：

10.1080/21663831.2021.1976293

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

IMPACT STATEMENT For the first time, ultralow-temperature superplasticity is found in commercial 7xxx Al alloy. This discovery enables the development of new technologies for the superplastic forming of complex-shaped products with enhanced service properties. The important benefits of ultrafine-grained (UFG) alloys for various applications stem from their enhanced superplastic properties. However, decreasing the temperature of superplasticity and providing superplastic forming at lower temperatures and higher strain rates is still a priority. Here, we disclose, for the first time, the mechanism by which grain boundary sliding and rotation are enhanced, when UFG materials have grain boundary segregation of specific alloying elements. Such an approach enables achieving superplasticity in commercial Al alloys at ultralow homologous temperatures below 0.5 (i.e. below 200 degrees C), which is important for developing new efficient technologies for manufacturing complex-shaped metallic parts with enhanced service properties.

引用

页码：475 / 482

页数：8

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