Hierarchical ultrafine-grained/nanocystalline Al-based bulk alloy with high strength and large plasticity

2012 ◽  
Vol 23 ◽  
pp. 199-203 ◽  
Author(s):  
Longchao Zhuo ◽  
Enhuai Yin ◽  
Hui Wang ◽  
Tao Zhang
Keyword(s):  
High Strength ◽  
Bulk Alloy ◽  
Ultrafine Grained

Mechanical Properties and Aging Behavior of Ultrafine Grained Al-Ag Alloy Fabricated by Accumulative Roll-Bonding

2014 ◽  
Vol 794-796 ◽  
pp. 851-856
Author(s):  
Tadashiege Nagae ◽  
Nobuhiro Tsuji ◽  
Daisuke Terada
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Accumulative Roll Bonding ◽  
Precipitation Hardening ◽  
Tensile Elongation ◽  
Solution Treatment ◽  
High Strength ◽  
Subsequent Aging ◽  
Roll Bonding ◽  
Ultrafine Grained

Accumulative roll-bonding (ARB) process is one of the severe plastic deformation processes for fabricating ultrafine grained materials that exhibit high strength. In aluminum alloys, aging heat treatment has been an important process for hardening materials. In order to achieve good mechanical properties through the combination of grain refinement hardening and precipitation hardening, an Al-4.2wt%Ag binary alloy was used in the present study. After a solution treatment at 550°C for 1.5hr, the alloy was severely deformed by the ARB process at room temperature (RT) up to 6 cycles (equivalent strain of 4.8). The specimens ARB-processed by various cycles (various strains) were subsequently aged at 100, 150, 200, 250°C, and RT. The hardness of the solution treated (ST) specimen increased by aging. On the other hand, hardness of the ARB processed specimen decreased after aging at high temperatures such as 250°C. This was probably due to coarsening of precipitates or/and matrix grains. The specimen aged at lower temperature showed higher hardness. The maximum harnesses achieved by aging for the ST specimen, the specimens ARB processed by 2 cycles, 4 cycles and 6 cycles were 55HV, 71HV, 69HV and 65HV, respectively. By tensile tests it was shown that the strength increased by the ARB process though the elongation decreased significantly. However, it was found that the tensile elongation of the ARB processed specimens was improved by aging without sacrificing the strength. The results suggest that the Al-Ag alloy having large elongation as well as high strength can be realized by the combination of the ARB process for grain refinement and the subsequent aging for precipitation hardening.

scholarly journals Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility

2015 ◽  
Vol 112 (47) ◽  
pp. 14501-14505 ◽  
Author(s):  
Xiaolei Wu ◽  
Muxin Yang ◽  
Fuping Yuan ◽  
Guilin Wu ◽  
Yujie Wei ◽  
...  
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
High Strength ◽  
Back Stress ◽  
Coarse Grained ◽  
Ultrafine Grain ◽  
Asymmetric Rolling ◽  
Dislocation Hardening ◽  
Ultrafine Grained ◽  
Lamella Structure

Grain refinement can make conventional metals several times stronger, but this comes at dramatic loss of ductility. Here we report a heterogeneous lamella structure in Ti produced by asymmetric rolling and partial recrystallization that can produce an unprecedented property combination: as strong as ultrafine-grained metal and at the same time as ductile as conventional coarse-grained metal. It also has higher strain hardening than coarse-grained Ti, which was hitherto believed impossible. The heterogeneous lamella structure is characterized with soft micrograined lamellae embedded in hard ultrafine-grained lamella matrix. The unusual high strength is obtained with the assistance of high back stress developed from heterogeneous yielding, whereas the high ductility is attributed to back-stress hardening and dislocation hardening. The process discovered here is amenable to large-scale industrial production at low cost, and might be applicable to other metal systems.

scholarly journals Additive manufacturing of ultrafine-grained high-strength titanium alloys

Nature ◽  
2019 ◽  
Vol 576 (7785) ◽  
pp. 91-95 ◽  
Author(s):  
Duyao Zhang ◽  
Dong Qiu ◽  
Mark A. Gibson ◽  
Yufeng Zheng ◽  
Hamish L. Fraser ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Titanium Alloys ◽  
High Strength ◽  
Ultrafine Grained

A novel way for fabricating ultrafine grained Cu-4.5 vol% Al2O3 composite with high strength and electrical conductivity

2019 ◽  
Vol 155 ◽  
pp. 109775 ◽  
Author(s):  
Chenguang Li ◽  
Yuehuang Xie ◽  
Dengshan Zhou ◽  
Wei Zeng ◽  
Jun Wang ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Strength ◽  
Al2o3 Composite ◽  
Ultrafine Grained

High strength high electrical conductivity ultrafine-grained Al–Y alloy processed via cold drawing

2020 ◽  
Vol 772 ◽  
pp. 138824 ◽  
Author(s):  
Mengmeng Wang ◽  
Haiyang Lv ◽  
Chi Zhang ◽  
Min Li ◽  
Haiyan Gao ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
High Strength ◽  
Cold Drawing ◽  
High Electrical Conductivity ◽  
Ultrafine Grained

Development of High-Strength, Fine, and Ultrafine-Grained Shape Memory Alloys

2018 ◽  
Vol 119 (13) ◽  
pp. 1346-1349
Author(s):  
V. G. Pushin ◽  
N. N. Kuranova ◽  
A. V. Pushin
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
High Strength ◽  
Ultrafine Grained
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