High-strength and tunable plasticity in sputtered Al-Cr alloys with multistage phase transformations

被引：12

作者：

Li, Qiang ^{[1
]}

Shang, Zhongxia ^{[1
]}

Sun, Xing ^{[1
]}

Fan, Cuncai ^{[2
]}

Su, Ruizhe ^{[1
]}

Richter, Nicholas A. ^{[1
]}

Fan, Zhe ^{[2
]}

Zhang, Yifan ^{[1
]}

Xue, Sichuang ^{[1
]}

Wang, Haiyan ^{[1
,3
]}

Zhang, Xinghang ^{[1
]}

机构：

[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA

[2] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[3] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA

来源：

INTERNATIONAL JOURNAL OF PLASTICITY | 2021年 / 137卷

关键词：

High strength; Plasticity; In-situ micromechanical testing; Phase transformation; Amorphous; STRAIN-RATE SENSITIVITY; MECHANICAL-PROPERTIES; NANOCRYSTALLINE METALS; TEMPERATURE STRENGTH; CORROSION-RESISTANCE; TENSILE DEFORMATION; ATOMIC-STRUCTURE; AMORPHOUS ALLOY; GRAIN-SIZE; SHEAR-BAND;

D O I：

10.1016/j.ijplas.2020.102915

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

To raise mechanical strength of metallic materials, methods such as grain refinement and amorphization are usually utilized but sacrifice plasticity. Strength and plasticity are largely dictated by dislocation-defect interactions in crystalline materials and by shear banding in metallic glasses, depending significantly on the length scales of microstructural features. Here we report on the evolution of microstructures and multistage phase transformations from micro/nanocrystalline to an entirely amorphous structure, realized by tailoring the composition of Cr in co-sputtered Al100 xCrx (x = 0-25 at%) alloys. The associated Cr segregation caused the formations of different dual-phase nanocomposites. In-situ micromechanical experiments revealed that the flow stress of Al-Cr alloys can reach 2.4 GPa and the deformation behaviors varied drastically with Cr composition. This study established the mechanistic connection between the Cr composition-dependent evolution of microstructure and ultrahigh strength as well as plasticity, and revealed the benefits of building nanocomposites through a multistage phase transformation to improve the plasticity of nanocrystalline and amorphous materials.

引用

页数：18

共 127 条

[1] Temperature-dependent size effects on the strength of Ta and W micropillars [J].