A kind of ni-fe-al alloy with linear superelasticity and preparation method thereof

Abstract

The invention discloses a Ni-Fe-Al alloy with linear superelasticity and a preparation method thereof. The composition and content (by atomic percentage) of the alloy are: nickel (Ni) is 56.5-51%, iron (Fe) It is 18.5-22%, and the rest is aluminum (Al). The Ni-Fe-Al alloy is directly prepared by powder metallurgy technology, and the process includes mixing, pressing, sintering and heat treatment (quenching). The alloy sintered billet exhibits linear superelasticity after quenching treatment, and the elastic recovery is 3-7%. The invention has a wide range of applications. In actual engineering, the superelasticity can be used to absorb and dissipate the vibration energy of the structure. It can be used to make mechanical sensing and control elements, human body orthopedic elements, damping elements, high-efficiency elastic elements, and wave absorbing and reducing elements. Shock and noise prevention devices, overload protection monitoring and forecasting of structural parts.

Description

technical field

[0001] The invention belongs to the technical field of alloy materials, and relates to an alloy with linear superelasticity and a preparation method thereof, more specifically, to a Ni-Fe-Al alloy with linear superelasticity and a powder metallurgy preparation method thereof. Background technique

[0002] At present, there are many reports on Ti-Ni series, Cu-based, Fe-based and magnetic superelastic alloy systems at home and abroad.

[0003] Ni-Ti alloy has the characteristics of high specific strength, good biocompatibility, excellent damping, non-magnetic, corrosion resistance, wear resistance, etc., and has good superelasticity in the phase transition region. After a certain process, the linear The hyperelastic strain can reach 4%, and the non-linear hyperelastic strain can reach about 8%. But the phase transition temperature of Ti-Ni alloy is low, and the price is expensive, and it is difficult to process and form.

[0004] Cu-based alloys are thermoel...

Examples

Embodiment 1

[0020] Step 1) Weigh the components according to atomic percentage: nickel (Ni) is 56.5%, iron (Fe) is 18.5%, aluminum (Al) is 25%, and these three powders are placed in a mixing tank and mixed evenly.

[0021] Step 2) Pressing the powder into shape with a pressing pressure of 500 MPa.

[0022] Step 3) Vacuum sintering at a sintering temperature of 1280° C., holding time for 2 hours, and cooling with the furnace.

[0023] Step 4) Heating the alloy sintered billet to 1280° C. and keeping it warm for 2 hours, taking it out and immediately performing quenching treatment.

[0024] For the Ni prepared above 56.5 Fe 18.5 al 25 The mechanical properties of the alloy were tested, and it was found that the quenched state of the alloy showed complete linear superelasticity, and the elastic recovery was 4.3%.

Embodiment 2

[0026] Step 1) Weigh the components according to atomic percentage: nickel (Ni) is 56.5%, iron (Fe) is 18.5%, aluminum (Al) is 25%, and these three powders are placed in a mixing tank and mixed evenly.

[0027] Step 2) Pressing the powder into shape with a pressing pressure of 500 MPa.

[0028] Step 3) Vacuum sintering at a sintering temperature of 1280° C., holding time for 2 hours, and cooling with the furnace.

[0029] Step 4) Heating the alloy sintered billet to 1200° C. and keeping it warm for 16 hours, taking it out and immediately performing quenching treatment.

[0030] For the Ni prepared above 56.5 Fe 18.5 al 25 The mechanical properties of the alloy were tested, and it was found that the quenched state of the alloy showed complete linear superelasticity, and the elastic recovery was 4.2%.

Embodiment 3

[0032] Step 1) Weigh the components according to atomic percentage: nickel (Ni) is 56%, iron (Fe) is 19%, aluminum (Al) is 25%, and these three powders are placed in a mixing tank and mixed evenly.

[0033] Step 2) Pressing the powder into shape with a pressing pressure of 500 MPa.

[0034] Step 3) Vacuum sintering at a sintering temperature of 1280° C., holding time for 2 hours, and cooling with the furnace.

[0035] Step 4) Heating the alloy sintered billet to 1280° C. and keeping it warm for 2 hours, taking it out and immediately performing quenching treatment.

[0036] For the Ni prepared above 56 Fe 19 al 25 The mechanical properties of the alloy were tested, and it was found that the quenched state of the alloy showed complete linear superelasticity, and the elastic recovery was 4.2%.

technical field

[0001] The invention belongs to the technical field of alloy materials, and relates to an alloy with linear superelasticity and a preparation method thereof, more specifically, to a Ni-Fe-Al alloy with linear superelasticity and a powder metallurgy preparation method thereof. Background technique

[0002] At present, there are many reports on Ti-Ni series, Cu-based, Fe-based and magnetic superelastic alloy systems at home and abroad.

[0003] Ni-Ti alloy has the characteristics of high specific strength, good biocompatibility, excellent damping, non-magnetic, corrosion resistance, wear resistance, etc., and has good superelasticity in the phase transition region. After a certain process, the linear The hyperelastic strain can reach 4%, and the non-linear hyperelastic strain can reach about 8%. But the phase transition temperature of Ti-Ni alloy is low, and the price is expensive, and it is difficult to process and form.

[0004] Cu-based alloys are thermoel...

Examples

Embodiment 1

[0020] Step 1) Weigh the components according to atomic percentage: nickel (Ni) is 56.5%, iron (Fe) is 18.5%, aluminum (Al) is 25%, and these three powders are placed in a mixing tank and mixed evenly.

[0021] Step 2) Pressing the powder into shape with a pressing pressure of 500 MPa.

[0022] Step 3) Vacuum sintering at a sintering temperature of 1280° C., holding time for 2 hours, and cooling with the furnace.

[0023] Step 4) Heating the alloy sintered billet to 1280° C. and keeping it warm for 2 hours, taking it out and immediately performing quenching treatment.

[0024] For the Ni prepared above 56.5 Fe 18.5 al 25 The mechanical properties of the alloy were tested, and it was found that the quenched state of the alloy showed complete linear superelasticity, and the elastic recovery was 4.3%.

Embodiment 2

[0026] Step 1) Weigh the components according to atomic percentage: nickel (Ni) is 56.5%, iron (Fe) is 18.5%, aluminum (Al) is 25%, and these three powders are placed in a mixing tank and mixed evenly.

[0027] Step 2) Pressing the powder into shape with a pressing pressure of 500 MPa.

[0028] Step 3) Vacuum sintering at a sintering temperature of 1280° C., holding time for 2 hours, and cooling with the furnace.

[0029] Step 4) Heating the alloy sintered billet to 1200° C. and keeping it warm for 16 hours, taking it out and immediately performing quenching treatment.

[0030] For the Ni prepared above 56.5 Fe 18.5 al 25 The mechanical properties of the alloy were tested, and it was found that the quenched state of the alloy showed complete linear superelasticity, and the elastic recovery was 4.2%.

Embodiment 3

[0032] Step 1) Weigh the components according to atomic percentage: nickel (Ni) is 56%, iron (Fe) is 19%, aluminum (Al) is 25%, and these three powders are placed in a mixing tank and mixed evenly.

[0033] Step 2) Pressing the powder into shape with a pressing pressure of 500 MPa.

[0034] Step 3) Vacuum sintering at a sintering temperature of 1280° C., holding time for 2 hours, and cooling with the furnace.

[0035] Step 4) Heating the alloy sintered billet to 1280° C. and keeping it warm for 2 hours, taking it out and immediately performing quenching treatment.

[0036] For the Ni prepared above 56 Fe 19 al 25 The mechanical properties of the alloy were tested, and it was found that the quenched state of the alloy showed complete linear superelasticity, and the elastic recovery was 4.2%.

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