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Preparation method of Fe-Al intermetallic compound-based micro-lamellar composite material

An intermetallic compound and composite material technology, which is applied in the field of preparation of Fe-Al intermetallic compound-based micro-laminated composite materials, can solve the problem that the requirements of vacuum degree and other process conditions are very strict, and the layered thickness and uniformity of the composite plate are not good. , the problem of unsatisfactory distribution of intermetallic compounds, etc., to achieve the effect of ideal alloying distribution, easy industrial production, and overall deformation coordination

Active Publication Date: 2019-02-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the low plasticity and low fracture resistance of intermetallic compounds at room temperature, as well as their high strength and low creep strength at high temperatures, it is difficult to apply them to the preparation of laminated materials through conventional processing techniques; In the existing process of preparing intermetallic compound-based micro-laminated composites, SHS in-situ synthesis technology improves the brittleness and fracture toughness of intermetallic compounds, but the layered thickness and uniformity of the composite plate after rolling are not good, resulting in Unsatisfactory distribution of intermetallic compounds after reaction
The preparation process of hot-rolling compounding combined with multi-stage heat treatment can successfully prepare intermetallic compound-based laminated composite materials, but when the layered thickness reaches micron level, it cannot make the overall coordinated deformation of each component layer, and there will be no delamination and interlayer fracture. and other defects, and the requirements for process conditions such as vacuum degree are very strict

Method used

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  • Preparation method of Fe-Al intermetallic compound-based micro-lamellar composite material
  • Preparation method of Fe-Al intermetallic compound-based micro-lamellar composite material
  • Preparation method of Fe-Al intermetallic compound-based micro-lamellar composite material

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Effect test

Embodiment 1

[0042] Prepare iron and aluminum plates with the same length and width after surface cleaning, wherein the thickness of the iron plate is 1mm, and the thickness of the aluminum plate is 0.27mm; heat the iron plate and aluminum plate in a heating furnace for softening treatment, and then perform surface grinding respectively;

[0043] A plurality of surface-polished iron plates and aluminum plates are alternately stacked together, each aluminum plate is located between two adjacent iron plates, and then all the aluminum plates and iron plates are wrapped and fixed with aluminum foil to obtain a blank; The number of layers is 6 layers, and the total number of layers of the aluminum plate is 5 layers; the thickness of the blank formed after the above operations is 8.2mm;

[0044] Heating the heating furnace to 400±10°C, then placing the billet in the heating furnace for 20 minutes, and then taking it out for single-pass hot pressing, with a reduction rate of 32%, to obtain a hot-p...

Embodiment 2

[0051] Method is with embodiment 1, and difference is:

[0052] (1) Carry out the third stress relief annealing when the total reduction reaches 79%;

[0053] (6) The heat treatment temperature is 650°C, and the time is 24h; the average thickness of the single-layer Fe-Al intermetallic compound layer is 22 μm; the metallographic micrograph of the Fe-Al intermetallic compound-based micro-laminated composite material is as follows image 3 As shown, the microscopic morphology of the cross-section is as Figure 4 Shown; the tensile strength at a temperature of 600°C is 95MPa, and the high temperature elongation at a temperature of 600°C is 22%.

Embodiment 3

[0055] Method is with embodiment 1, and difference is:

[0056] (1) The thickness of the aluminum plate is 0.25mm;

[0057] (2) The thickness of the blank formed after surface treatment and wrapping and fixing is 7.5mm;

[0058] (3) The reduction rate of single-pass hot pressing is 23%;

[0059] (4) Place the hot-pressed plate in a heating furnace at 450°C for 15 minutes, and the reduction rate of single-pass hot rolling is 38%; the thickness of the hot-rolled plate is 3.58mm;

[0060] (5) The reduction rate of each pass of cold rolling is 4 to 10%. When the total reduction rate reaches 58%, the first stress relief annealing is carried out, and when the total reduction rate reaches 74%, the second stress relief is performed. Annealing, when the total reduction rate reaches 79%, carry out the third stress relief annealing, when the total reduction rate reaches 87%, complete cold rolling;

[0061] (6) The heat treatment temperature is 630°C and the time is 16h; the average th...

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Abstract

The invention discloses a preparation method of a Fe-Al intermetallic compound-based micro-lamellar composite material. The preparation method comprises the following steps: (1) preparing iron platesand an aluminum plates with the same length and width after surface cleaning, and heating the plates for softening treatment and surface polishing respectively; (2) alternately stacking up the iron plates and aluminum plates with each aluminum plate positioned between two adjacent iron plates, and wrapped and fixed by an aluminum foil; (3) heating a heating furnace to 400+ / -10 DEG C, putting a blank into the heating furnace for heat preservation and then hot pressing; (4) heating the heating furnace to 400 to 450 DEG C, putting a hot pressing plate into the heating furnace for heat preservation and then hot rolling; (5) carrying out multi-pass cold rolling, and carrying out stress-relief annealing for three times in the cold rolling process; and (6) carrying out alloying heat treatment. According to the preparation method provided by the invention, a technical route of near net forming is adopted, so that the problem that intermetallic compounds are difficult to process subsequently issolved; and moreover, the process method is simple, the flow is reasonable, the requirement on the operating environment is not high, the cost of raw materials is low, and industrial production is easier to realize.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a Fe-Al intermetallic compound-based micro-lamination composite material. Background technique [0002] Fe-Al intermetallic compounds have long-range orderly arrangement of atoms, strong binding force, and the characteristics of both metal bonds and covalent bonds, so they have some special physical, chemical and mechanical properties; at the same time, Fe-Al intermetallic compounds also exhibit It has high specific strength and medium temperature strength, has abnormal yield strength and temperature relationship, and its raw material is cheap, so it is considered to be a new type of high temperature structural material between superalloys and ceramics; as a new generation of medium and high temperature Structural materials and substitute materials for stainless steel, Fe-Al intermetallic compounds have broad application prospects in aerospac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/02B21B1/38
CPCB21B1/38B21B2001/386B21C37/02
Inventor 祖国胤罗驰李霏李志刚孙溪黄鹏
Owner NORTHEASTERN UNIV
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