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Ball milling and shape memory alloys

Ti-50Ni and Ti-40Ni-10Cu (at.%) shape memory alloy poweders have been fabricated by the ball milling method. Their alloying behaviour and transformation behaviour were investigated by means of optical microscopy, electron microscopy, X-ray diffractometry and differential scanning calorimetry. As-milled Ti-Ni powders fabricated with a milling time of less than 20 hrs were a mixture of pure

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  • Synthesis and characterization of shape memory Nano
    Synthesis and characterization of shape memory Nano

    Earlier works done by most of the authors on shape memory effect were based on conventional method of synthesis. We have focused on synthesis of shape memory alloy by mechanical alloying using high energy ball mill. Ball to powder ratio, milling medium, and speed of ball mill are important parameters which influence effectiveness of milling

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  • Phase transformation of NiTi shape memory alloy powders
    Phase transformation of NiTi shape memory alloy powders

    May 27, 2009 May 27, 2009 Ni 50.8 Ti 49.2 alloy powders of different particle shapes and sizes have been prepared by ball milling. The powder milled for 1. h has large flaky particles and are partially amorphous.. The powder crystallized through a single-stage exothermic transformation upon heating. Powders milled for longer durations consisted of partially amorphous Ni–Ti, [Fe,Ni] and Ni–Cr–Fe

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  • Crystallization of Mechanically Alloyed Ni50Ti50 and
    Crystallization of Mechanically Alloyed Ni50Ti50 and

    25 Shape Memory Alloys Piotr Salwa and Tomasz Goryczka (Submitted September 2, 2019; in revised form March 30, 2020; published online May 4, 2020) The Ni 50Ti 50 and Ti 50Ni 25Cu 25 alloys were produced in the form of powder using the high-energy ball milling. In the as-milled state, both alloys revealed presence of an amorphous state with a

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  • Materials Science & Engineering A
    Materials Science & Engineering A

    Ball milling has been recognized to be effective in avoiding the brittleness of the magnetic shape memory alloy by making use of the powder form in composite or sintered form [19–21]. Therefore, the fracture behavior and phase transition of the dual phase alloys after ball milling are investigated. Fig. 3(a), (c) and (e) shows the

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  • Effect of aging and ball milling on the phase
    Effect of aging and ball milling on the phase

    Zr8 alloys were mechanically crushed to a size of 3 mm and then ball milled for 0.5 h in a QM-3A vibration ball mill with hardened steel vial and balls in a ball-to-powder ratio of 10: 1. The acetone was added as the milling medium and the milling speed was 1400 rpm/min. Finally the as-milled powders were annealed at 800 C for 2 h in vacuum

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  • NASA shape memory alloys - Aerospace Manufacturing and
    NASA shape memory alloys - Aerospace Manufacturing and

    Dec 05, 2017 Dec 05, 2017 The NASA Glenn team has created process-finished SMA rods 1 in diameter up to 10ft long, starting with 8 , 150-lb ingots. One application is a torque tube that can be used for rotary motion. When heated, it twists to drive a wing flap. Shape memory alloys at the microscopic level, showing crystal micro-structure

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  • Mechanical Behavior of Nanostructured Melt Spun
    Mechanical Behavior of Nanostructured Melt Spun

    the known shape memory alloys, NiTi is the most commonly used because of its excellent mechanical properties, corrosion resistance and biocompatibility. A variety of methods have been attempted in order to create finer-grained shape memory alloys. These include ultrarapid melt quenching, ball milling followed by powder metallurgy

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  • Preparation of Cu-Al-Nb shape memory alloys by high
    Preparation of Cu-Al-Nb shape memory alloys by high

    Abstract. This work focuses on the necessary conditions for obtaining Cu-Al-Nb based shape memory alloys by means of mechanical alloying powder metallurgy

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  • Phase transformation of NiTi shape memory alloy
    Phase transformation of NiTi shape memory alloy

    On the contrary, the wet ball milling method under liquid medium should be a better method to prevent the contamination and fabricate pure Ni-Mn-Ga ferromagnetic shape memory alloy powders. View

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  • Cu-Al-Nb SHAPE MEMORY ALLOYS OBTAINED BY
    Cu-Al-Nb SHAPE MEMORY ALLOYS OBTAINED BY

    The obtaining of Cu-based memory shape alloys by mechanical alloying of elemental powders was investigated for Cu85Al13Nb2 system. The alloying process during milling has been characterized by X-ray diffraction. It is observed that the Cu-Al solid solution can be obtained at short milling times

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  • Strengthening Mechanism of TiNi Shape Memory
    Strengthening Mechanism of TiNi Shape Memory

    2) particles by a planetary ball mill, and consolidated by spark plasma sintering (SPS) at a sintering temperature of 1173 K in vacuum (6 Pa). Subsequently, the SPSed TiNi alloy compacts were extruded at a pre-heated temperature of 1373 K, and shape memory heat-treated at

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  • High-Energy Ball Milling Conditions in Formation of NiTiCu
    High-Energy Ball Milling Conditions in Formation of NiTiCu

    Request PDF | High-Energy Ball Milling Conditions in Formation of NiTiCu Shape Memory Alloys | The properties and the shape memory effect depend, among other things, on chemical composition, as

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  • Micromilling of NiTi Shape-Memory Alloys with Ball Nose
    Micromilling of NiTi Shape-Memory Alloys with Ball Nose

    In the micromilling of shape memory alloys (SMA) using TiAlN-coated ball nose ... selection is better for the milling of NiTi shape memory alloy as used as medical implant materials that can

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  • A Novel Powder Metallurgy Processing Approach to Prepare
    A Novel Powder Metallurgy Processing Approach to Prepare

    Feb 10, 2012 The proposed powder metallurgy route for preparing Cu-Al-Ni shape-memory alloy strip consists of wet ball milling of the elemental Cu, Al, and Ni powders in the required proportions in a high-energy ball mill for a short period of time using acetone as a process control agent. Subsequently, powder preforms are prepared from the milled powder

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  • Preparation of CuAlNi-based shape memory alloys by
    Preparation of CuAlNi-based shape memory alloys by

    Jan 01, 1997 Jan 01, 1997 The ball-to In recent years, Cu-based shape memory alloys(SMA) have powder weight ratio(BPR) is 5: 1. The specification of elemental been widely developed because of their more competitive cost and powders and the initial powder mixture is shown in Table 1. easier fabrication process than for Ni-Ti SMA

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  • NASA shape memory alloys - Aerospace Manufacturing
    NASA shape memory alloys - Aerospace Manufacturing

    Dec 05, 2017 The NASA Glenn team has created process-finished SMA rods 1 in diameter up to 10ft long, starting with 8 , 150-lb ingots. One application is a torque tube that can be used for rotary motion. When heated, it twists to drive a wing flap. Shape memory alloys at the microscopic level, showing crystal micro-structure

    Read More
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