A titanium-based amorphous alloy that can be used for superplastic forming

Abstract

The application belongs to the field of amorphous alloy preparation, and particularly relates to a titanium-based amorphous alloy which can be used for superplastic forming. a Er b Cr c Ni d Si e Be f ; wherein a represents the atomic percentage of Ti, 55<=a<=65; b represents the atomic percentage of Er, 9<=b<=13; c represents the atomic percentage of Cr, 15<=c<=22; d represents the atomic percentage of Ni, 4<=d<=8; e represents the atomic percentage of Si, 0<=e<=3; f represents the atomic percentage of Be, 0<=f<=8; and the sum of a, b, c, d, e and f is 100. The titanium-based amorphous alloy has a large supercooled liquid phase region, is not easy to crystallize when heated to the supercooled liquid phase region, and has superplasticity in the supercooled liquid phase region, so that the amorphous alloy is convenient to process and form.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of amorphous alloy preparation, in particular to a titanium-based amorphous alloy for superplastic forming. BACKGROUND

[0002] Amorphous alloy is a kind of new alloy material with long-range disorder and short-range order of constituent atoms. Due to its unique microstructure, it has excellent mechanical, physical and chemical properties than conventional crystalline metal materials.

[0003] Titanium-based bulk amorphous alloy has a wide application prospect in new high-temperature corrosion-resistant structural materials and biomedical devices due to its extremely high fracture strength, low density, excellent room-temperature corrosion resistance and low cost, and therefore has attracted extensive attention and research. However, the existing titanium-based amorphous alloy is prone to crystallization during heating due to its small supercooled liquid phase region. SUMMARY

[0004] The purpose of the present application is to provide a titanium-based amorphous alloy for superplastic forming.

[0005] In order to solve the above technical problems, the present application provides a titanium-based amorphous alloy for superplastic forming, the composition of which is represented by the general formula: Ti a Er b Cr c Ni d Si e Be f ; wherein a represents the atomic percentage of Ti, 55≤a≤65; b represents the atomic percentage of Er, 9≤b≤13; c represents the atomic percentage of Cr, 15≤c≤22; d represents the atomic percentage of Ni, 4≤d≤8; e represents the atomic percentage of Si, 0≤e≤3; f represents the atomic percentage of Be, 0≤f≤8; and the sum of a, b, c, d, e and f is 100.

[0006] Further, the titanium-based amorphous alloy for superplastic forming is prepared by the following method:

[0007] (1) The specific weight of metal raw materials is weighed according to the component ratio, Ti is first added to the crucible, and then the vacuum melting furnace is opened to melt under the induction of the melting power after the vacuum is extracted to below 10 Pa;

[0008] (2) After observing that Ti is completely melted through the observation window, the other component metal raw materials are continuously added through the feeder, and the molten liquid is poured into the mold after complete melting, and then cooled to room temperature.

[0009] Further, the melting temperature in step (1) is 1700-1850℃.

[0010] Further, after the Ti is completely melted in the step (2), the remaining metal raw materials are added, and the temperature is maintained at 1250-1350 DEG C to continue the melting until complete melting.

[0011] Further, the mold used in the step (2) is a copper mold.

[0012] Further, the width of the supercooled liquid phase region of the titanium-based amorphous alloy is 90-125 DEG C.

[0013] The titanium-based amorphous alloy of the present application has a large supercooled liquid phase region, and crystallization does not easily occur when heated to the supercooled liquid phase region, and the amorphous alloy has superplasticity in the supercooled liquid phase region, so that it can be processed and formed.

[0014] Other features and advantages of the present application will be set forth in the descriptions that follow, and in part will be apparent from the descriptions, or can be learned by practice of the present application. The purposes and other advantages of the present application will be realized and attained by the structures particularly pointed out in the description and the appended drawings.

[0015] In order to make the above objectives, features and advantages of the present application more apparent, the following will describe a preferred embodiment, and the accompanying drawings will be described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0017] Figure 1 is a titanium-based amorphous alloy rod prepared in Example 1 of the present application;

[0018] Figure 2 is a DSC graph of the titanium-based amorphous alloy rod prepared in Example 1 of the present application;

[0019] Figure 3 is a cross-section center metallographic structure of the titanium-based amorphous alloy rod prepared in Example 1 of the present application;

[0020] Figure 4 is a plate material of the titanium-based amorphous alloy rod prepared in Example 1 of the present application after superplastic forming. DETAILED DESCRIPTION

[0021] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0022] Embodiment 1

[0023] The titanium-based amorphous alloy prepared in the embodiment has a composition of Ti 59 Er 10 Cr 15.5 Ni5Si 2.5 Be8, and the preparation method is as follows:

[0024] (1) The metal raw materials of specific weights according to the component proportions are weighed respectively, Ti is first added into a crucible, and then the crucible is placed into a vacuum melting furnace, vacuum is extracted to below 10 Pa, and an induction melting power is turned on to perform melting;

[0025] (2) After Ti is completely melted by observation through an observation window, other component metal raw materials are continuously added through a feeder, and after complete melting is observed through the observation window, the molten liquid is poured into a copper mold, and cooled to room temperature to obtain a Ti 59 Er 10 Cr 15.5 Ni5Si 2.5 Be8 amorphous alloy rod, as shown in Figure 1 .

[0026] The differential scanning calorimetry (DSC) is used to perform thermodynamic analysis on the alloy to obtain relevant thermodynamic parameters, and the titanium-based amorphous alloy with a composition of Ti 59 Er 10 Cr 15.5 Ni5Si 2.5 Be8 has a DSC curve as shown in Figure 2 , and specific thermodynamic parameters are shown in Table 1.

[0027] Embodiment 2

[0028] The titanium-based amorphous alloy prepared in the embodiment has a composition of Ti 55 Er 13 Cr 21.5 Ni8Be 2.5 , and the preparation method is as follows:

[0029] (1) The metal raw materials of specific weights according to the component proportions are weighed respectively, Ti is first added into a crucible, and then the crucible is placed into a vacuum melting furnace, vacuum is extracted to below 10 Pa, and an induction melting power is turned on to perform melting;

[0030] (2) After Ti is completely melted by observing the observation window, other component metal raw materials are continuously added through the feeder, and after complete melting is observed through the observation window, the molten liquid is poured into a copper mold, cooled to room temperature, and Ti 55 Er 13 Cr 21.5 Ni8Be 2.5 amorphous alloy rod.

[0031] Differential scanning calorimetry (DSC) is used to analyze the thermodynamics of the alloy, and relevant thermodynamic parameters are obtained. The composition of the titanium-based amorphous alloy is Ti 55 Er 13 Cr 21.5 Ni8Be 2.5 The specific thermodynamic parameters of the titanium-based amorphous alloy with the composition of Ti

[0032] Example 3

[0033] The titanium-based amorphous alloy prepared in this example has a composition of Ti 64.5 Er 11 Cr 18.5 Ni4Si2, and the preparation method is as follows:

[0034] (1) The specific weight of the metal raw materials is weighed according to the component ratio. First, Ti is added to the crucible and placed in a vacuum melting furnace. Vacuum is extracted to below 10 Pa, and the induction melting power is turned on for melting;

[0035] (2) After Ti is completely melted by observing the observation window, other component metal raw materials are continuously added through the feeder, and after complete melting is observed through the observation window, the molten liquid is poured into a copper mold, cooled to room temperature, and Ti 64.5 Er 11 Cr 18.5 Ni4Si2 amorphous alloy rod.

[0036] Differential scanning calorimetry (DSC) is used to analyze the thermodynamics of the alloy, and relevant thermodynamic parameters are obtained. The composition of the titanium-based amorphous alloy is Ti 64.5 Er 11 Cr 18.5 Ni4Si2. The specific thermodynamic parameters of the titanium-based amorphous alloy with the composition of Ti

[0037] Example 4

[0038] The titanium-based amorphous alloy prepared in this example has a composition of Ti 61 Er 11.5 Cr 17 Ni4Si 1.5 Be5, and the preparation method is as follows:

[0039] (1) according to the ingredient proportion, the specific weight of the metal raw material is weighed respectively, Ti is first added into the crucible, and is put into the vacuum melting furnace, vacuum is extracted to below 10 Pa, the induction melting power is opened to carry out melting;

[0040] (2) after Ti is completely melted through the observation window, the other ingredient metal raw material is continuously added through the feeder, after complete melting is observed through the observation window, the melt is poured into the copper mold, and is cooled to room temperature to obtain Ti 61 Er 11.5 Cr 17 Ni4Si 1.5 Be5amorphous alloy rod.

[0041] The differential scanning calorimetry (DSC) is used to carry out thermodynamic analysis on the alloy, and the related thermodynamic parameters are obtained, and the component of the titanium-based amorphous alloy is Ti 61 Er 11.5 Cr 17 Ni4Si 1.5 Be5.

[0042] Table 1: composition and thermodynamic parameters of the titanium-based amorphous alloy of the application

[0043]

[0044] The titanium-based amorphous alloy rod with the component of Ti 55 Er 13 Cr 21.5 Ni8Be 2.5 in example 1 is made into a metallographic sample, after polishing the metallographic sample, etching with 1% concentration of hydrofluoric acid, and observing under an optical microscope, the microstructure metallographic picture is taken as Figure 3 shown, no grain is found, indicating that the 9mm titanium-based alloy rod is not crystallized.

[0045] The titanium-based amorphous alloy rod with the component of Ti 59 Er 10 Cr 15.5 Ni5Si 2.5 Be8in example 1 is subjected to superplastic forming to obtain a plate as Figure 4 shown.

[0046] According to the above ideal embodiments according to the application, through the above description, the related staff can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A titanium-based amorphous alloy that can be used for superplastic forming, characterized in that, The general formula for the composition of this titanium-based amorphous alloy is: Ti a Er b Cr c Ni d Si e Be f Where a represents the atomic percentage of Ti, 55≤a≤65; b represents the atomic percentage of Er, 9≤b≤13; c represents the atomic percentage of Cr, 15≤c≤22; d represents the atomic percentage of Ni, 4≤d≤8; e represents the atomic percentage of Si, 0≤e≤3; f represents the atomic percentage of Be, 0≤f≤8; and the sum of a, b, c, d, e, and f is 100, and e and f are not both 0.

2. A titanium-based amorphous alloy for superplastic forming as described in claim 1, characterized in that, It is prepared by the following steps: (1) Weigh specific weights of metal raw materials according to the composition ratio, first add Ti into the crucible, put it into the vacuum melting furnace, evacuate to below 10Pa, and turn on the induction melting power supply for melting; (2) After observing that Ti has completely melted through the observation window, continue to add other component metal raw materials through the feeder. After it has completely melted, pour the molten liquid into the mold and cool it to room temperature.

3. The titanium-based amorphous alloy for superplastic forming according to claim 2, characterized in that, The melting temperature in step (1) is 1700-1850℃.

4. The titanium-based amorphous alloy for superplastic forming according to claim 2, characterized in that, In step (2), after Ti is completely melted, the remaining metal raw materials are added and the melting is continued at 1250-1350℃ until it is completely melted.

5. The titanium-based amorphous alloy for superplastic forming according to claim 2, characterized in that, The mold used in step (2) is a copper mold.

6. The titanium-based amorphous alloy for superplastic forming according to claim 2, characterized in that, The width of the supercooled liquid phase region of the titanium-based amorphous alloy is 90–125°C.

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