Microstructural Evolution and Microhardness Variations in Pure Titanium Processed by High-Pressure Torsion

被引：23

作者：

Chen, Wanji ^{[1
,2
]}

Xu, Jie ^{[1
,2
]}

Liu, Detong ^{[1
,2
]}

Bao, Jianxing ^{[1
,2
]}

Sabbaghianrad, Shima ^{[3
,4
]}

Shan, Debin ^{[1
,2
]}

Guo, Bin ^{[1
,2
]}

Langdon, Terence G. ^{[3
,4
,5
]}

机构：

[1] Harbin Inst Technol, Minist Educ, Key Lab Microsyst & Microstruct Mfg, Harbin 150080, Peoples R China

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[3] Univ Southern Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[4] Univ Southern Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

[5] Univ Southampton, Dept Mech Engn, Mat Res Grp, Southampton SO17 1BJ, Hants, England

来源：

ADVANCED ENGINEERING MATERIALS | 2020年 / 22卷 / 06期

基金：

中国国家自然科学基金; 欧洲研究理事会;

关键词：

high-pressure torsion; microforming; microstructures; pure titanium; ultrafine grains; COMMERCIAL PURITY TITANIUM; MECHANICAL-PROPERTIES; PHASE-TRANSFORMATION; GRAIN-SIZE; METALS; ALLOY; PRINCIPLES; STRENGTH; BEHAVIOR; EXAMINE;

D O I：

10.1002/adem.201901462

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A grade 2 pure titanium with an initial grain size of approximate to 50 mu m is processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa. The microhardness variations are examined and the results show that the disks are reasonably homogeneous after 10 turns of torsional straining. The microstructural evolution is systematically characterized by optical microscopy, X-ray diffraction, and transmission electron microscopy to provide information on the effect of shear strain on grain size and microstructure. The results demonstrate that the initial coarse structure is gradually refined from the edge to the center of the disk under the shear stress during HPT processing and an ultrafine-grained pure Ti is achieved with an average grain size of approximate to 96 nm after 10 turns. A model is developed by considering the formation of subgrain boundaries, twins, and high-angle grain boundaries for the grain re?nement of pure Ti processed by HPT.

引用

页数：10

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