A preparation method of γ-tial alloy with preferential orientation of lamellar interface and fine lamellar characteristics

A preferred orientation and interface technology, applied in the field of TiAl intermetallic compounds, can solve problems such as insufficient high temperature performance and poor room temperature plasticity

Active Publication Date: 2022-07-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a γ-TiAl alloy with a preferred orientation of the lamellar interface and fine lamellar characteristics, and obtain a plate-like γ-TiAl alloy with the lamellar interface parallel to the surface of the casting and fine lamellar characteristics The sample can effectively solve the problems of poor room temperature plasticity and insufficient high temperature performance of blades and other unidirectionally stressed structural components

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  • A preparation method of γ-tial alloy with preferential orientation of lamellar interface and fine lamellar characteristics
  • A preparation method of γ-tial alloy with preferential orientation of lamellar interface and fine lamellar characteristics
  • A preparation method of γ-tial alloy with preferential orientation of lamellar interface and fine lamellar characteristics

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Embodiment

[0032]In this embodiment, the selected alloy composition is Ti-48Al-2Cr-2Nb (at%), and its primary phase is α; the selected metal mold 10 is a thick-walled steel mold without preheating, and the cavity of the metal mold 10 is Plate-like, with the largest temperature gradient in its thickness direction, and satisfying In the formula, G is the actual temperature gradient in the liquid phase at the front of the solid-liquid interface (K / μm), R is the crystal growth rate (the advancing speed of the solid-liquid interface into the liquid phase) (μm / s), and m is the phase diagram Slope of the upper liquidus (dimensionless), c 0 is the solute content (%), k 0 is the solute partition coefficient (dimensionless), and D is the diffusion coefficient of the solute in the liquid phase (μm 2 / s). Since the primary phase of Ti-48Al-2Cr-2Nb is α, the α phase preferentially grows along the [0001] direction in the thickness direction, forming a neat and long α columnar crystal; the lamellar...

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Abstract

The invention relates to the field of TiAl intermetallic compounds, in particular to a preparation method of a γ-TiAl alloy with lamellar interface preferential orientation and fine lamellar features. After selecting the γ-TiAl alloy composition, the γ-TiAl alloy liquid is filled in the mold of the thick-walled plate cavity without preheating; the γ-TiAl casting is prepared by the vacuum suction casting device with large filling power and easy control. The macrostructure of the plate-like γ-TiAl casting is composed of the surface fine grain layer and the columnar crystal structure of regular and opposite length. surface). When the load direction is parallel to the lamination interface, the γ-TiAl casting exhibits an excellent combination of strength and plasticity, which can effectively solve the problems of poor room temperature plasticity and insufficient high temperature performance of unidirectionally stressed structural components such as blades.

Description

technical field [0001] The invention relates to the field of TiAl intermetallic compounds, in particular to a preparation method of a γ-TiAl alloy with lamellar interface preferential orientation and fine lamellar features. Background technique [0002] TiAl intermetallic compounds are considered as an ideal lightweight high-temperature structural material due to their low density, high specific strength, high specific modulus, excellent creep resistance and oxidation resistance. Replacing nickel-based superalloys to make aerospace structural parts and ground system rotating or reciprocating structural parts, the thrust-to-weight ratio and fuel efficiency are greatly improved. However, the poor room temperature ductility and insufficient performance of TiAl alloys at higher temperatures limit its wide application. Scholars at home and abroad have carried out extensive research on the above-mentioned problems and achieved some results. Among them, grain refinement and direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/06C22C1/02C22C30/00
CPCB22D18/06C22C1/02C22C1/026C22C14/00C22C21/003C22C30/00
Inventor 崔玉友夏智州刘荣华杨锐
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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