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Method for semi-solid formation and connection integration of titanium alloy and aluminum alloy

A semi-solid forming, aluminum alloy technology, applied in the field of semi-solid forming and connecting integration of titanium alloy and aluminum alloy, and semi-solid forming and connecting integration, can solve the problem that the uniformity of the joint material bonding strength is difficult to meet the requirements, the flexibility is poor, and the connection It can avoid the formation of large thickness brittle compound layer, achieve precise forming and high connection reliability.

Inactive Publication Date: 2016-05-11
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difficulty of solid-phase welding between titanium and aluminum, there are disadvantages such as low efficiency and poor flexibility; while titanium-aluminum fusion welding has problems such as large welding crack tendency, large welding deformation, and serious brittle metal compounds, and the reliability of the connection is not high. The bonding strength between materials and the uniformity of joints are difficult to meet the requirements

Method used

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  • Method for semi-solid formation and connection integration of titanium alloy and aluminum alloy
  • Method for semi-solid formation and connection integration of titanium alloy and aluminum alloy
  • Method for semi-solid formation and connection integration of titanium alloy and aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment one: TA2 titanium alloy and 6063 aluminum alloy

[0028] a. In order to facilitate putting the preheated aluminum alloy semi-solid billet into the titanium alloy tube, consider that the coefficient of thermal expansion is 2.3×10 -5 Factors, the TA2 titanium alloy pipe is processed into a TA2 titanium alloy pipe with a size of φ50mm×5mm×h40mm; the 6063 aluminum alloy bar is processed into a 6063 aluminum alloy billet with a size of φ39mm×h50.6mm;

[0029] b. Put the TA2 titanium alloy tube into the mold and preheat together, the preheating temperature is 300°C;

[0030] c. Using an electromagnetic induction heating device to preheat the 6063 aluminum alloy billet to 620°C and keep it warm for 20 minutes, the 6063 aluminum alloy billet is converted into a semi-solid billet with a liquid phase rate of 60%;

[0031] d. Move the 6063 aluminum alloy semi-solid blank 3 that has been preheated and insulated into the TA2 titanium alloy tube in the mould, ensuring tha...

Embodiment 2

[0033] Embodiment 2: TA7 titanium alloy and 7075 aluminum alloy

[0034] a. Process the TA7 titanium alloy pipe into a TA7 titanium alloy pipe with a size of φ60mm×5mm×h45mm.

[0035] b. Put the TA7 titanium alloy tube into the mold for preheating together, the preheating temperature is 320°C;

[0036] c. Process the 7075 aluminum alloy bar into a billet with a size of φ49mm×h62mm, preheat the 7075 aluminum alloy billet to 620°C with an electromagnetic induction heating device, and keep it warm for 18 minutes. The conversion rate of the 7075 aluminum alloy billet to liquid phase is 56%. semi-solid billet;

[0037] d. Move the preheated and heat-preserved 7075 aluminum alloy semi-solid blank into the TA7 titanium alloy tube in the mould, ensuring that the 7075 aluminum alloy semi-solid blank is adjacent to the TA7 titanium alloy tube;

[0038] e. The punch goes down quickly and pressurizes 190KN, the speed of the punch down is 10mm / s, and the holding time is 15s, so that the ...

Embodiment 3

[0039] Embodiment three: TB2 titanium alloy and 2024 aluminum alloy

[0040] a. Process the TB2 titanium alloy pipe into a TB2 titanium alloy pipe with a size of φ40mm×5mm×h35mm;

[0041] b. Put the TB2 titanium alloy tube into the mold and preheat together, the preheating temperature is 350°C;

[0042] c. Process the 2024 aluminum alloy bar stock into a billet with a size of φ29mm×h50mm, preheat the 2024 aluminum alloy billet to 630°C with an electromagnetic induction heating device, and keep it warm for 15 minutes. The 2024 aluminum alloy billet is converted into a liquid phase rate of 50%. semi-solid billet;

[0043] d. Move the preheated and heat-preserved 2024 aluminum alloy semi-solid blank into the TB2 titanium alloy tube in the mould, ensuring that the 2024 aluminum alloy semi-solid blank is adjacent to the TB2 titanium alloy tube;

[0044] e. The punch goes down rapidly and pressurizes 180KN, the speed of the punch is 10mm / s, and the holding time is 20s, so that the...

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Abstract

The invention discloses a method for semi-solid formation and connection integration of a titanium alloy and an aluminum alloy. The method comprises the following steps: a preconnected titanium alloy is prepared to a titanium alloy pipe with a certain size and shape; the titanium alloy pipe is put in a mold for preheating; an aluminum alloy is prepared to a semi-solid blank or semi-solid slurry with a liquid phase rate of 50-60%; the aluminum alloy semi-solid blank or semi-solid slurry is shifted into the titanium alloy pipe of the mold; and a convex mold quickly moves downwards, and is pressed to realize die-forging connection integral formation. The method realizes precise formation of the aluminum alloy by using excellent fluidity of the aluminum alloy in the semi-solid state, prevents formation of a high-thickness brittle compound layer, can form a stable interface through a reaction between a liquid phase in the aluminum alloy semi-solid blank and the titanium alloy, and is high in connecting reliability. In addition, the method is simple and feasible, needs no special equipment, and adopts a common hydropress to realize the formation and connection integration of the titanium alloy and the aluminum alloy.

Description

technical field [0001] The invention relates to a method for the integration of semi-solid forming and connection, in particular to a method for the integration of semi-solid forming and connecting of titanium alloy and aluminum alloy, belonging to the technical field of material connection and forming. Background technique [0002] The material connection structure has the excellent properties of various materials, so it has been widely used in aerospace, space technology, nuclear industry, microelectronics, automobile, petrochemical and other fields. Due to the great difference in the physical and chemical properties of the pre-connected materials, the requirements for the connection are relatively strict. [0003] Semi-solid forming includes rheological forming and thixoforming. The obtained semi-solid non-dendritic slurry is directly formed and processed, which is called rheological forming; and the slurry is first solidified into an ingot, and then the metal ingot is c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/00
CPCB22D17/007
Inventor 陈刚韩柳娜宋晓国赵洪运韩飞冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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