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shape memory alloys

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Series: ASM Handbook
Volume: 2
Publisher: ASM International
Published: 01 January 1990
DOI: 10.31399/asm.hb.v02.a0001100
EISBN: 978-1-62708-162-7
... Abstract This article discusses the history of shape memory alloys (SMAs) along with their properties, capabilities, and crystallography, including phase transformations that occur during thermal treatment. It describes the thermomechanical behaviors of SMAs and explains how to characterize...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003160
EISBN: 978-1-62708-199-3
... Abstract The term shape memory alloys (SMAs) refers to the group of metallic materials that demonstrate the ability to return to some previously defined shape or size when subjected to the appropriate thermal procedure. Materials that exhibit shape memory only upon heating are referred...
Series: ASM Handbook
Volume: 23
Publisher: ASM International
Published: 01 June 2012
DOI: 10.31399/asm.hb.v23.a0005658
EISBN: 978-1-62708-198-6
... fatigue heat treatment medical device design nitinol physical metallurgy physical properties shape memory alloys superelasticity tensile properties THIS ARTICLE is not intended as a treatise of Nitinol or the shape memory effect but rather focuses on specific aspects of Nitinol...
Image
Published: 01 January 1990
Fig. 4 M s temperatures and compositions of Cu-Zn-Al shape memory alloys More
Image
Published: 01 December 1998
Fig. 1 Characteristics of shape memory alloys. (a) Typical transformation versus temperature curve for a specimen under constant load (stress) as it is cooled and heated. T , transformation hysteresis. M s , martensite start; M f , martensite finish; A s , austenite start; A f , austenite More
Image
Published: 15 December 2019
Fig. 37 Martensite in nitinol (Ni-50at.%Ti) shape memory alloy revealed by etching using equal parts HNO 3 , acetic acid, and hydrofluoric acid, and viewed using bright field (a) and Nomarski DIC (b). Nomarski DIC reveals more detail compared with bright field. More
Image
Published: 15 December 2019
Fig. 44 As-polished Cu-26%Zn-5%Al shape memory alloy viewed using polarized light (a) and Nomarski DIC (b). Both imaging modes vividly reveal ß 1 martensite formed in face-centered cubic alpha phase by cycling the alloy through the shape memory alloy thermal cycle. More
Image
Published: 01 December 2004
Fig. 12 Microstructure of a shape memory alloy (Cu-26%Zn-5%Al) showing β 1 martensite in a face-centered cubic alpha matrix, using Nomarski differential interference contrast without etching. The magnification bar is 25 μm long. More
Image
Published: 01 December 2004
Fig. 43 (a) Copper-zinc shape memory alloy showing equal proportions of variants A, B, C, and D. (b) Variant D becomes dominant after thermomechanical training. Source: Ref 37 . Reprinted with permission More
Book Chapter

Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003736
EISBN: 978-1-62708-177-1
... the stages of the tempering process involved in ferrous martensite. The article also describes the formation of the martensite structure in nonferrous systems. It concludes with a discussion on shape memory alloys. ceramics martensite shape memory materials tempering MARTENSITE is a metastable...
Series: ASM Handbook
Volume: 4E
Publisher: ASM International
Published: 01 June 2016
DOI: 10.31399/asm.hb.v04e.a0006261
EISBN: 978-1-62708-169-6
..., special-purpose alloys such as nitinol shape memory alloys, low-expansion alloys, electrical-resistance alloys and soft magnetic alloys. Finally, the article focuses on heat treatment modeling for selecting the appropriate heat treatment process. aging annealing corrosion-resistant nickel alloys...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006579
EISBN: 978-1-62708-290-7
... Abstract This article is a detailed account of additive manufacturing (AM) processes for copper and copper alloys such as copper-chromium alloys, GRCop, oxide-dispersion-strengthened copper, copper-nickel alloys, copper-tin alloys, copper-zinc alloys, and copper-base shape memory alloys. The AM...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003776
EISBN: 978-1-62708-177-1
... micrographs, comparing and contrasting the microstructural features of gold, platinum, iridium, palladium, and ruthenium-base alloys. It examines pure gold, intermetallic gold compounds, gold and platinum jewelry alloys, platinum-containing shape memory alloys, and alloys consisting of platinum, aluminum...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
.... It also covers failures of shape memory alloy springs and failures caused by corrosion and operating conditions. corrosion failure analysis fatigue failures material defects mechanical springs shape memory alloys MECHANICAL SPRINGS are used in mechanical components to exert force, provide...
Image
Published: 15 December 2019
memory alloy heat treatment (held at 100 °C, or 210 °F, for 2 min and water quenched), forming martensite, which produces shear at the free surface. The crisscrossed pattern is produced by forming some martensite during the hot mounting cycle, polishing, and then forming new martensite using the shape More
Image
Published: 01 December 2004
Fig. 33 Surface relief due to thermoelastic martensite transformation in a copper-zinc shape memory alloy. Source: Ref 37 . Reprinted with permission More
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006684
EISBN: 978-1-62708-213-6
... structure, although the intermetallic structures are hard to see. In Fig. 37 , martensite in a nitinol shape memory alloy (SMA) after etching using equal parts nitric acid, acetic acid, and hydrofluoric acid is revealed more clearly using DIC than bright field. Fig. 35 Example of comet tails after...
Book: Machining
Series: ASM Handbook
Volume: 16
Publisher: ASM International
Published: 01 January 1989
DOI: 10.31399/asm.hb.v16.a0002192
EISBN: 978-1-62708-188-7
... and small), radiation shielding, gyroscope rotors, and aircraft counterweights ( Ref 5 ). Some unique characteristics of uranium and uranium alloys that affect their machinability include: Shape memory A nonisotropic coefficient of thermal expansion Their pyrophoric, radioactive, and toxic...
Book Chapter

By Dongyang Li
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006382
EISBN: 978-1-62708-192-4
... Memory Alloys Pseudo-elastic shape memory alloys, for example, TiNi alloys ( Ref 17 ), are found to possess excellent resistance to abrasion under certain conditions. The high wear resistance of TiNi is attributed to its pseudo-elasticity, which results from a reversible stress-induced martensitic...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0003730
EISBN: 978-1-62708-177-1
... structures from solid-state transformations are covered in subsequent articles on: Precipitation structures Spinodal decomposition Ordered structures Eutectoid structures Massive transformation Martensitic structures (ferrous, non-ferrous, shape memory) Bainitic structures...