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Crystallite Orientation Analysis for a Multidirectionally Cold Rolled α-Ti Alloy (TA7) Thin Sheet

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Rare Metals 1989年第2期9卷 31-36页

作者： Zuo, Liang Liang, Zhide Xu, Jiazhen Zhao, Xiang Northeast Univ of Technology China

A microcomputer software determining the crystallite orientation distribution functions (ODFs) and inverse pole figures of hexagonal materials with or without orthorhombic physical symmetry has been worked out the first time. The texture measurements and the ODF calculations were performed for a multidirectionally cold rolled α-Ti alloy (TA7) sheet by the application of this software. It is shown that the rolling planes of most grains in the sheet tend to be parallel to (0001) with a deviation to the extent of 40° and is shown a predominance of the orientation zone containing (1016), while the rolling directions are, as a whole, uniformly distributed along all the directions over the rolling planes. Of all the texture components, (2¯117) [01¯10] is slightly stronger than the other.

关键词： Computer Programming Flowcharting Crystals Orientation Mathematical Techniques Least Squares Approximations metallography Textures titanium metallography Computer Simulation

TEM Morphology and FCP Rate of Ti-5Al-2Mo-3Zr Alloy

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Rare Metals 1989年第3期9卷 27-32页

作者： Deng, Yongrui Qiu, Dongyao Gao, Liang Univ of Science and Technology China

The transmission electron microscopic morphology of the phases and fatigue crack propagation (FCP) rate of Ti-5Al-2Mo-3Zr alloy were investigated in this study. Microstructure of the alloy consists of α and β phases after furnace- and air-cooling, and interfacial phase appears at the boundaries between these two phases. After water quenching, the microstructure consists primary of α and h.c.p. martensite α′ which assumes acicular. There are many twins within the α′ plates. No retained β phase exists after quenching from any temperature. During aging, β particles precipitated along the boundaries and inside the martensite plates with Burgers orientation relationship. The fatigue crack propagation rate (low frequency) is not sensitive to the microstructure, tensile strength and rolling direction. Analysis of the fractography shows that main cracks propagated serpentinely and secondary cracks existed everywhere. In high stress intensity range, the resistance of FCP is better than that of Ti-6Al-4V.

关键词： Metals and Alloys Structural Microscopic Examination Transmission Electron Microscopy titanium Aluminum Alloys Mechanical Properties titanium and Alloys Crack Propagation titanium metallography Microstructures

Anisotropy of Superplasticity in Hot-rolled Sheet of Ti-10V-2Fe-3Al

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Rare Metals 1990年第2期10卷 124-130页

作者： Bai, Bingzhe Beijing Research Inst of Mechanical and Electrical Technology China

A superplastic tension test was carried out in order to examine the anisotropy of superplasticity in hot rolled sheet of Ti-10V-2Fe-3Al. Flow stress in the longitudinal (L) direction is higher than that in the transverse (T) direction of the sheet. The peak value of elongation in L direction specimens is also higher within a strain rate range of 0.0005-0.0083/s. Based on microstructure changes before and after superplastically deformation, an analysis is made for multi-necking on the T specimen after tension. The flowlines in superplastically deformed specimen are described.

关键词： Rolling Mill Practice Hot Rolling Strain titanium metallography Microstructures