Ultra-low temperature service nickel-titanium-niobium shape memory alloy

A memory alloy, nickel-titanium-niobium technology, applied in the field of shape memory alloys, can solve the problem that the alloy cannot fully meet the requirements of ultra-low temperature service of connectors and fasteners, and achieve the effect of high recovery stress

Active Publication Date: 2021-07-30
SICHUAN UNIV
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  • Abstract
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Problems solved by technology

This leads to Ni 47 Ti 44 Nb 9 Alloys can no longer fully meet the requirements for ultra-low temperature service of connectors and fasteners in the aerospace field

Method used

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  • Ultra-low temperature service nickel-titanium-niobium shape memory alloy

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It is worth noting that the given embodiments can not be interpreted as limiting the protection scope of the present invention, and some non-essential improvements and adjustments made by those skilled in the art according to the content of the present invention above should still belong to the protection of the present invention. scope.

[0011] The alloy compositions of Examples 1-8 and Comparative Examples 1-7 are shown in Table 1, wherein A represents the atomic percentage content ratio of nickel and titanium, and Nb, Ti and Ni represent the atomic percentage content of their respective elements. Examples 1-8 all satisfy the two conditions of 1.087≤A≤1.25 and (46%×A-47%)≤Nb≤12%, and Example 5 also meets the condition of Nb=46%×A-43%. Comparative examples 1, 2 and 7 do not satisfy the condition of 1.087≤A≤1.25, but satisfy the condition of (46%×A-47%)...

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Abstract

The invention discloses a nickel-titanium-niobium shape memory alloy for ultra-low temperature service, belonging to the field of shape memory alloys. The nickel-titanium-niobium shape memory alloy is composed of nickel, titanium and niobium, and the alloy composition must meet the following conditions: 1.087≤A≤1.25, (46%×A‑47%)≤Nb≤12%, where A Represents the atomic percentage content ratio of nickel and titanium, and Nb represents the atomic percentage content of niobium. After pre-deformation, the above-mentioned nickel-titanium-niobium shape memory alloy can still maintain high recovery stress at temperatures below minus 100° C. and can be stored at room temperature. Therefore, the connectors and fasteners made of the above-mentioned nickel-titanium-niobium shape memory alloy can be stored at room temperature and can be used at temperatures below minus 100°C.

Description

technical field [0001] The invention relates to the field of shape memory alloys, in particular to an ultra-low temperature service nickel-titanium-niobium shape memory alloy. Background technique [0002] Nickel-titanium shape memory alloys are widely used in the fields of mechatronics, aerospace and biomedicine because of their excellent shape memory effect, superelasticity and comprehensive mechanical properties. However, when nickel-titanium shape memory alloys are used as connectors and fasteners, they must be stored at low temperature after pre-deformation, which significantly reduces the convenience of their engineering applications and increases the cost. To solve the above problems, Ni 47 Ti 44 Nb 9 Nickel-titanium-niobium shape memory alloy represented by wide phase transformation hysteresis came into being. After pre-deformation, Ni 47 Ti 44 Nb 9 The starting temperature of the martensitic reverse transformation of the alloy is higher than room temperature,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C19/03C22F1/00C22F1/10
CPCC22C19/007C22C19/03C22C30/00C22F1/006C22F1/10
Inventor 文玉华彭华备范啟超
Owner SICHUAN UNIV
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