Search results for: T. Nakata

Items from 1 to 20 out of 128 results

article

Horizontal orientation facilitates pollen transfer and rain damage avoidance in actinomorphic flowers of Platycodon grandiflorus

T. Nakata, I. Rin, Y. A. Yaida, A. Ushimaru, more

In zoophilous plants, floral orientation evolved under both biotic and abiotic pressure to enhance pollination success. However, the adaptive significance of horizontal orientation in radially symmetrical (actinomorphic) flowers remains largely unknown, although that of bilaterally symmetrical flowers has been well studied. We experimentally altered floral angle in a population of insect‐pollinated...

article

Microstructure and mechanical properties of extruded Mg–Gd–Y–Zn alloy with Mn or Zr addition

C. Xu, T. Nakata, G. H. Fan, X. W. Li, more

Journal of Materials Science > 2019 > 54 > 14 > 10473- 10488

The microstructure and mechanical properties of the extruded Mg–2Gd–1.2Y–0.5Zn (at.%) alloy with Mn or Zr addition were investigated. The results show that Zr addition refines the microstructure of the homogenized alloy more efficiently and facilitates the dissolution of the secondary phases in comparison with Mn addition. After extrusion at 400 °C, both Mn and Zr added alloys exhibit bimodal microstructure...

article

Bake-hardenable Mg–Al–Zn–Mn–Ca sheet alloy processed by twin-roll casting

M.Z. Bian, T.T. Sasaki, T. Nakata, Y. Yoshida, more

Acta Materialia > 2018 > 158 > C > 278-288

Mg–1.3Al–0.8Zn–0.7Mn–0.5Ca (wt.%) (AZMX1110) alloy sheet produced by low-cost twin-roll casting process exhibits excellent room temperature formability with a large Index Erichsen (I.E.) value of 7.8 mm at room temperature in a solution treated condition (T4). The large I.E. value is associated with a weak basal texture in the T4-condition. This alloy shows rapid age-hardening response at 170 °C,...

article

Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion

M.G. Jiang, C. Xu, H. Yan, G.H. Fan, more

Acta Materialia > 2018 > 157 > C > 53-71

Commercial Mg extrusions usually develop various types of basal textures, affecting the formability and mechanical properties. The mechanisms for the formation of basal texture variations were systematically investigated for the first time based on the twinning and dynamic recrystallization (DRX) during extrusion using electron back-scatter diffraction (EBSD) characterization. The results indicate...

article

Effects of rolling conditions on the microstructure and mechanical properties in a Mg–Al–Ca–Mn–Zn alloy sheet

M.Z. Bian, T.T. Sasaki, T. Nakata, S. Kamado, more

Materials Science and Engineering: A > 2018 > 730 > C > 147-154

Mg–1.2Al–0.3Ca–0.4Mn–0.3Zn (AXMZ1000) (wt%) alloy was rolled in three different conditions in order to understand the effects of the rolling conditions on the microstructure and mechanical properties. The sheet subjected to high temperature reheating at 500 °C for 5 min prior to each 100 °C rolling delivers the highest Index Erichsen (I.E.) value of 7.0 mm. The sheet rolled at 300 °C with 500 °C reheating...

article

Deformation Behavior of Ultra-Strong and Ductile Mg-Gd-Y-Zn-Zr Alloy with Bimodal Microstructure

C. Xu, G. H. Fan, T. Nakata, X. Liang, more

Metallurgical and Materials Transactions A > 2018 > 49 > 5 > 1931-1947

An ultra-strong and ductile Mg-8.2Gd-3.8Y-1Zn-0.4Zr (wt pct) alloy was developed by using hot extrusion to modify the microstructure via forced-air cooling and an artificial aging treatment. A superior strength–ductility balance was obtained that had a tensile yield strength of 466 MPa and an elongation to failure of 14.5 pct. The local strain evolution during the in situ testing of the ultra-strong...

article

Improving mechanical properties and yield asymmetry in high-speed extrudable Mg-1.1Al-0.24Ca (wt%) alloy by high Mn addition

T. Nakata, C. Xu, R. Ajima, Y. Matsumoto, more

Materials Science and Engineering: A > 2018 > 712 > C > 12-19

The chemical composition of a Mg-1.1Al-0.33Ca-0.44Mn (wt%) alloy, AXM10304, has been optimized for high speed extrusion. The extrudability is substantially improved from 24m/min to 60m/min by slightly reducing the Ca content from 0.33wt% to 0.24wt%. Then, the effect of Mn content on the mechanical properties and microstructures of extruded Mg-1.1Al-0.24Ca based alloys were investigated. In a solution-treated...

article

Improving creep property of Mg–Gd–Zn alloy via trace Ca addition

C. Xu, T. Nakata, K. Oh-ishi, T. Homma, more

Scripta Materialia > 2017 > 139 > C > 34-38

Only trace Ca addition to the Mg–2Gd–0.5Zn–0.2Zr (at.%) alloy leads to the precipitation of Guinier-Preston (GP) zones and remarkably improves the creep resistance at elevated temperatures. The Mg–2Gd–0.5Zn–0.4Ca–0.2Zr alloy exhibits a minimum creep rate of 5.75×10⁻⁸s⁻¹ tested at 250°C and 110MPa, its superior creep resistance is attributed to the precipitation of dense GP zones on the basal plane,...

article

A heat-treatable Mg–Al–Ca–Mn–Zn sheet alloy with good room temperature formability

M.Z. Bian, T.T. Sasaki, B.C. Suh, T. Nakata, more

Scripta Materialia > 2017 > 138 > C > 151-155

A newly developed magnesium sheet alloy, Mg–1.1Al–0.3Ca–0.2Mn–0.3Zn (at.%), shows a large Index Erichsen value of 7.7mm in a solution treated (T4) condition due to a weak basal texture developed by the trace addition of Zn. Subsequent artificial aging at 200°C for 1h (T6) significantly increases the 0.2% proof strength from 144MPa to 204MPa. This improvement in strength by the T6 treatment is associated...

article

Letter: a potassium‐competitive acid blocker vs a proton pump inhibitor for healing endoscopic submucosal dissection‐induced artificial ulcers after treatment of gastric neoplasms

H. Ban, M. Sugimoto, T. Otsuka, M. Murata, more

Alimentary Pharmacology & Therapeutics > 46 > 5 > 564 - 565

article

Strong and ductile age-hardening Mg-Al-Ca-Mn alloy that can be extruded as fast as aluminum alloys

T. Nakata, C. Xu, R. Ajima, K. Shimizu, more

Acta Materialia > 2017 > 130 > C > 261-270

We have developed a wrought magnesium alloy, Mg-1.3Al-0.3Ca-0.4Mn (wt.%) or AXM10304, that can be extruded at a very high die-exist speed of 24 m/min, comparable to the extrusion speed for aluminum alloys, and that exhibits an excellent combination of strength and elongation after an age-hardening, i.e., a tensile 0.2% proof stress of 287 MPa and an elongation of 20%. The high tensile proof stress...

article

Enhancing strength and ductility of Mg-Zn-Gd alloy via slow-speed extrusion combined with pre-forging

M.G. Jiang, C. Xu, T. Nakata, H. Yan, more

Journal of Alloys and Compounds > 2017 > 694 > C > 1214-1223

Mg-1.58Zn-0.52Gd (wt.%) alloy was subjected to slow-speed extrusion at 350 °C and 400 °C combined with hot pre-forging. The extruded alloy without pre-forging exhibited a bimodal microstructure, consisting of fine dynamically recrystallized (DRXed) grains and coarse unDRXed grains elongated along the extrusion direction, and strong basal texture, while pre-forging changed the bimodal structure into...

article

Effect of extrusion parameters on microstructure and mechanical properties of Mg-7.5Gd-2.5Y-3.5Zn-0.9Ca-0.4Zr (wt%) alloy

C. Xu, T. Nakata, X.G. Qiao, H.S. Jiang, more

Materials Science and Engineering: A > 2017 > 685 > C > 159-167

As-cast Mg-7.5Gd-2.5Y-3.5Zn-0.9Ca-0.4Zr (wt%) alloy was indirectly extruded using different parameters. The microstructure, texture and mechanical properties of the as-extruded alloys were investigated. Hot extrusion effectively refines the microstructure and fragments the coarse phases in the as-cast alloy. The alloys extruded at 400°C exhibit bimodal microstructure comprising fine dynamically recrystallized...

article

Hot compression deformation behavior of Mg-9Gd-2.9Y-1.9Zn-0.4Zr-0.2Ca (wt%) alloy

C. Xu, J.P. Pan, T. Nakata, X.G. Qiao, more

Materials Characterization > 2017 > 124 > C > 40-49

Hot deformation behavior of the homogenized and quenched Mg-9Gd-2.9Y-1.9Zn-0.4Zr-0.2Ca (wt%) alloy was investigated by compression test at temperatures of 300–500°C and strain rates of 0.001–10s⁻¹. The flow stress is sensitive to the deformation temperature and strain rate, which increases with increasing strain rate and decreasing temperature. The processing map constructed at the strain of 0.9 shows...

article

Effects of Geometry and Dimension of Specimen and Rig on Small Punch Creep Property

T. Nakata, S. Komazaki, Y. Kohno, H. Tanigawa

Experimental Mechanics > 2017 > 57 > 3 > 487-494

The purpose of this study was to examine the effects of the geometries and dimensions of the rig and specimen of a small punch (SP) test on the determined creep property. The SP creep property of a specimen was evaluated using finite element analysis by varying the specimen thickness and diameter, diameter of the spherical and hemispherical indentation punches, inner diameter of the lower die, and...

article

High-speed extrusion of dilute Mg-Zn-Ca-Mn alloys and its effect on microstructure, texture and mechanical properties

M.G. Jiang, C. Xu, T. Nakata, H. Yan, more

Materials Science and Engineering: A > 2016 > 678 > C > 329-338

Three dilute Mg-Zn-Ca-Mn alloys were successfully extruded at 24m/min and the alloy with lowest Zn content (0.21wt%) can even be extruded at 60m/min without any surface defects, which was ascribed to the thermally stable Mg₂Ca phase and high solidus temperature (∼620°C). The alloys extruded at die-exit speed ≥6m/min showed a fully dynamically recrystallized (DRXed) microstructure and weak rare earth...

article

Optimization of Mn content for high strengths in high-speed extruded Mg-0.3Al-0.3Ca (wt%) dilute alloy

T. Nakata, C. Xu, Y. Matsumoto, K. Shimizu, more

Materials Science and Engineering: A > 2016 > 673 > C > 443-449

The effect of Mn content on mechanical properties and microstructure of Mg-0.3Al-0.3Ca-xMn (wt%, x=0, 0.2, 0.4, 0.8) dilute alloys extruded at a high die-exit speed of 60m/min has been investigated. The strengths of the as-extruded samples increased with increasing Mn content, and Mg-0.3Al-0.3Ca-0.8Mn (AXM030308) alloy exhibited the highest 0.2% proof stress of 190MPa. This is due to the formation...

article

Rare earth texture and improved ductility in a Mg-Zn-Gd alloy after high-speed extrusion

M.G. Jiang, C. Xu, T. Nakata, H. Yan, more

Materials Science and Engineering: A > 2016 > 667 > C > 233-239

Mg-1.58Zn-0.52Gd (wt%) alloy was successfully extruded at high extrusion speed of 60m/min, suggesting the much better extrudability than commercial AZ31 alloy. After high-speed extrusion (die-exit speed ≥24m/min), the Mg-Zn-Gd alloy exhibited a fully recrystallized microstructure with fine Mg₃Zn₃Gd₂ phase at grain boundaries (GBs) and within grain interiors and rare earth (RE) texture at the position...

article

Development of dilute Mg–Zn–Ca–Mn alloy with high performance via extrusion

M.G. Jiang, C. Xu, T. Nakata, H. Yan, more

Journal of Alloys and Compounds > 2016 > 668 > C > 13-21

Dilute Mg–0.21Zn–0.30Ca–0.14Mn (wt.%) alloy was newly developed as low-cost wrought Mg alloy. Excellent balance of strength and ductility was achieved via extrusion process by grain refinement and texture modification. The dilute alloy extruded at 300 °C exhibited a tensile yield strength of 307 MPa and an elongation of 20.6% due to a bimodal microstructure consisting of fine dynamically recrystallized...

chapter

On the Asymptotic Equivalence of L _p Metrics for Convergence to Normality

C. C. Heyde, T. Nakata

Selected Works in Probability and Statistics > Selected Works of C.C. Heyde > 376-385

Summary This paper is concerned with the rate of convergence to zero of the L _p metrics Δ_np, l ≦ p ≦ ∞, constructed out of differences between distribution functions, for departure from normality for normed sums of independent and identically distributed random variables with zero mean and unit variance. It is shown that the Δ...

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INFONA - science communication portal

Search results for: T. Nakata

Horizontal orientation facilitates pollen transfer and rain damage avoidance in actinomorphic flowers of Platycodon grandiflorus

Microstructure and mechanical properties of extruded Mg–Gd–Y–Zn alloy with Mn or Zr addition

Bake-hardenable Mg–Al–Zn–Mn–Ca sheet alloy processed by twin-roll casting

Unveiling the formation of basal texture variations based on twinning and dynamic recrystallization in AZ31 magnesium alloy during extrusion

Effects of rolling conditions on the microstructure and mechanical properties in a Mg–Al–Ca–Mn–Zn alloy sheet

Deformation Behavior of Ultra-Strong and Ductile Mg-Gd-Y-Zn-Zr Alloy with Bimodal Microstructure

Improving mechanical properties and yield asymmetry in high-speed extrudable Mg-1.1Al-0.24Ca (wt%) alloy by high Mn addition

Improving creep property of Mg–Gd–Zn alloy via trace Ca addition

A heat-treatable Mg–Al–Ca–Mn–Zn sheet alloy with good room temperature formability

Letter: a potassium‐competitive acid blocker vs a proton pump inhibitor for healing endoscopic submucosal dissection‐induced artificial ulcers after treatment of gastric neoplasms

Strong and ductile age-hardening Mg-Al-Ca-Mn alloy that can be extruded as fast as aluminum alloys

Enhancing strength and ductility of Mg-Zn-Gd alloy via slow-speed extrusion combined with pre-forging

Effect of extrusion parameters on microstructure and mechanical properties of Mg-7.5Gd-2.5Y-3.5Zn-0.9Ca-0.4Zr (wt%) alloy

Hot compression deformation behavior of Mg-9Gd-2.9Y-1.9Zn-0.4Zr-0.2Ca (wt%) alloy

Effects of Geometry and Dimension of Specimen and Rig on Small Punch Creep Property

High-speed extrusion of dilute Mg-Zn-Ca-Mn alloys and its effect on microstructure, texture and mechanical properties

Optimization of Mn content for high strengths in high-speed extruded Mg-0.3Al-0.3Ca (wt%) dilute alloy

Rare earth texture and improved ductility in a Mg-Zn-Gd alloy after high-speed extrusion

Development of dilute Mg–Zn–Ca–Mn alloy with high performance via extrusion

On the Asymptotic Equivalence of L _p Metrics for Convergence to Normality

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