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Nickel-titanium-niobium shape memory alloy capable of serving at ultralow temperature

A memory alloy, nickel-titanium-niobium technology, applied in the field of shape memory alloy, 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: 2020-04-17
SICHUAN UNIV
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  • Abstract
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  • Claims
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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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  • Nickel-titanium-niobium shape memory alloy capable of serving at ultralow temperature

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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 capable of serving at an ultralow temperature and belongs to the field of shape memory alloy. The nickel-titanium-niobium shape memory alloy is formed by the three elements of nickel, titanium and niobium, and meanwhile the components of the alloy need to meet the following conditions that A is higher than or equal to 1.087 andsmaller than or equal to 1.25, and Nb is higher than or equal to (46%*A-47%) and smaller than or equal to 12%, wherein A represents the atomic percent content ratio of nickel and titanium, and Nb represents the atomic percent content of the element niobium. After pre-deformation, the nickel-titanium-niobium shape memory alloy can still maintain high restore stress at minus 100 DEG C and can be stored at room temperature. Thus, connecting pieces and fastening pieces prepared from the nickel-titanium-niobium shape memory alloy can be stored at room temperature and can serve at the temperature lower than minus 100 DEG 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 Applications(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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