Microstructural Control for Superplasticity Simply by Heat Treatment without Thermomechanical Processing in a Ti-46AL-3.5Cr Alloy

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概要

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• Microstructural evolution only by heat treatment has been studied for a Ti–46at%Al–3.5at%Cr alloy, in order to obtain a microstructure which causes superplasticity at high temperatures. By changing the cooling rate from 1 613 K in the a-Ti single-phase region, three kinds of microstructures were identified. Namely, lamellar microstructure appeared by furnace cooling, feathery microstructure took place by air-cooling and massive microstructure prevailed by oil quenching. During subsequent annealing at 1473 K in the β + γ two-phase region, the feathery microstructure turns to fine microdual structure with the equiaxed γ grains with 13 υm in grain size and the β precipitates formed along the β grain boundaries. In a tensile test at 1473 K with a strain rate of 3.2×10-4s-1, this β/γ microdual structure exhibits remarkable superplastic deformation with an elongation of 450%, which is the same with that obtained by the β/γ microdual structure prepared by a thermomechanical processing. On the other hand, the lamellar microstructure and the massive microstructure are not transformed to the β/γ microdual structure with the equiaxed γ grains, resulting in low elongations of 30% and 110% at 1473 K, respectively.

• 社団法人 日本鉄鋼協会の論文
• 2000-10-15

著者

• Tomota Yo

  Department Of Materials Science Faculty Of Engineering Ibaraki University

• NAKAMURA Morihiko

  National Institute for Materials Science

• Nakamura Morihiko

  National Research Institute For Metals

• Niinobe Kouichi

  Graduate Student Of Ibaraki University

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• Residual Strain in Mechanically Ground Powders Al-Ti Base Ternary and Quaternary Compounds with L1_2 Single-Phase at 1450K
• Room Temperature Ductility of (AIMn)_2 Ti (V) Alloys with Ll_2 Structure
• Tensile Properties of TiAl Based Alloy in a Gaseous Hydrogen Atmosphere in a Temperature Range from Room Temperature to 973K
• Work-Hardening Behavior and Evolution of Dislocation-micro-structures in High-nitrogen Bearing Austenitic Steels
• Residual Thermal Phase Stresses in α-γ Fe-Cr-Ni Alloys Measured by a Neutron Diffraction Time-of-Flight Method
• Description of Stress-strain Curves Based on Thermal Activation Models for a Ti-Fe-0 Alloy at 77 to 296 K with Strain Rates from 10^ to 10^sec^
• Microstructural Control for Superplasticity Simply by Heat Treatment without Thermomechanical Processing in a Ti-46AL-3.5Cr Alloy
• Formation of Oriented Lamellar Colonies in a TIAlMn Alloy Produced by a Reactive Sintering
• Fabrication of Ti/Ti_5Si_3 Functionally Graded Material by Eutectic Bonding Method
• Internal Stress and Strain Energy Yielded by γ→εMartensitic Transformation in a Polycrystalline Ferrous Alloy

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