Effects of alloying elements on martensitic transformation behavior and damping capacity in Fe–17Mn alloy

The effect of rare earth element Nd addition on the microstructure and martensitic transformation behavior of Ni50Ti50−xNdx(x=0, 1, 3, 7, 20) shape memory alloy was investigated experimentally. The results showed that the microstructure of Ni-Ti-Nd ternary alloy consists of the NiNd phase and the NiTi matrix. One-step martensitic transformation was observed in all alloys. The martensitic transformation start temperatureMsincreased gradually with increasing Nd content for Ni-Ti-Nd alloys.

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Microstructure and Phase Transformation Analysis of Ni50−xTi50Lax Shape Memory Alloys

Crystals ◽

10.3390/cryst8090345 ◽

2018 ◽

Vol 8 (9) ◽

pp. 345 ◽

Cited By ~ 6

Author(s):

Weiya Li ◽

Chunwang Zhao

Keyword(s):

Phase Transformation ◽

Martensitic Transformation ◽

Shape Memory Alloys ◽

Shape Memory ◽

Martensite Transformation ◽

Transformation Behavior ◽

Ni Content ◽

Start Temperature

The microstructure and martensitic transformation behavior of Ni50−xTi50Lax (x = 0.1, 0.3, 0.5, 0.7) shape memory alloys were investigated experimentally. Results show that the microstructure of Ni50−xTi50Lax alloys consists of a near-equiatomic TiNi matrix, LaNi precipitates, and Ti2Ni precipitates. With increasing La content, the amounts of LaNi and Ti2Ni precipitates demonstrate an increasing tendency. The martensitic transformation start temperature increases gradually with increasing La content. The Ni content is mainly responsible for the change in martensite transformation behavior in Ni50−xTi50Lax alloys.

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Features of the damping capacity of Mn – Cu alloys

MATEC Web of Conferences ◽

10.1051/matecconf/202134401012 ◽

2021 ◽

Vol 344 ◽

pp. 01012

Author(s):

Sergey Naumov ◽

Svetlana Ginne

Keyword(s):

Sharp Decrease ◽

Alloying Elements ◽

Damping Capacity ◽

Natural Ageing ◽

Cu Alloys ◽

The Stability

Data on the damping capacity of Mn – Cu alloys are adduced. The results of studying the influence of alloying elements, natural ageing at temperatures of 293 K, 273 K and 263 K on the stability of the damping capacity of Mn – Cu alloys are presented. The high damping capacity of Mn – Cu alloys decreases by 4 ... 6 times during natural ageing at 293 K, remains during 1,7 years of natural ageing at 273 K and 263 K. The analysis of factors that should be considered responsible for a sharp decrease in the damping capacity of Mn – Cu alloys during natural ageing is submitted.

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Effect of Co-Doping on the Microstructure, Martensitic Transformation Behavior, and Magnetocaloric Effect of Ni-Mn-Sb-Si Ferromagnetic Shape Memory Alloys

Metallurgical and Materials Transactions A ◽

10.1007/s11661-018-4942-3 ◽

2018 ◽

Vol 49 (12) ◽

pp. 6416-6425

Author(s):

Ruochen Zhang ◽

Xuexi Zhang ◽

Mingfang Qian ◽

Lin Geng

Keyword(s):

Martensitic Transformation ◽

Shape Memory Alloys ◽

Shape Memory ◽

Magnetocaloric Effect ◽

Transformation Behavior ◽

Ferromagnetic Shape Memory Alloys ◽

Co Doping ◽

Ferromagnetic Shape Memory

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Effect of Grain Size on the Friction-Induced Martensitic Transformation and Tribological Properties of 304 Austenite Stainless Steel

Metals ◽

10.3390/met10091246 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1246

Author(s):

Bo Mao ◽

Shuangjie Chu ◽

Shuyang Wang

Keyword(s):

Grain Size ◽

Stainless Steel ◽

Martensitic Transformation ◽

Wear Rate ◽

Tribological Properties ◽

Friction And Wear ◽

Wear Behavior ◽

304 Stainless Steel ◽

Dry Sliding ◽

Transformation Behavior

Friction and wear performance of austenite stainless steels have been extensively studied and show a close relationship with the friction-induced martensitic transformation. However, how the grain size and associated friction-induced martensitic transformation behavior affect the tribological properties of austenite steels have not been systematically studied. In this work, dry sliding tests were performed on an AISI 304 stainless steel with a grain size ranging from 25 to 92 μm. The friction-induced surface morphology and microstructure evolution were characterized. Friction-induced martensitic transformation behavior, including martensite nucleation, martensite growth and martensite variant selection and its effect on the friction and wear behavior of the 304 stainless steel were analyzed. The results showed that both the surface coefficient of friction (COF) and the wear rate increase with the grain size. The COF was reduced three times and wear rate was reduced by 30% as the grain size decreased from 92 to 25 μm. A possible mechanism is proposed to account for the effect of grain size on the tribological behavior. It is discussed that austenite steel with refined grain size tends to suppress the amount of friction-induced martensitic transformed and significantly alleviates both the plowing and adhesive effect during dry sliding.

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Martensitic transformation behavior in Ti–Ni–X (Ag, In, Sn, Sb, Te, Tl, Pb, Bi) ternary alloys

Materials Research Bulletin ◽

10.1016/j.materresbull.2013.05.004 ◽

2013 ◽

Vol 48 (12) ◽

pp. 5064-5069 ◽

Cited By ~ 9

Author(s):

Jai-young Jang ◽

Su-jin Chun ◽

Nam-suk Kim ◽

Jeung-won Cho ◽

Jae-hyun Kim ◽

...

Keyword(s):

Martensitic Transformation ◽

Ternary Alloys ◽

Transformation Behavior

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Effect of Thermal Cycling (γε) on Martensitic Transformation Kinetics and Damping Capacity of Fe –17mass%Mn Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.319.59 ◽

2006 ◽

Vol 319 ◽

pp. 59-66 ◽

Cited By ~ 6

Author(s):

Young Kook Lee ◽

Young Seob Seo ◽

Won Jin ◽

Chong Sool Choi

Keyword(s):

Martensitic Transformation ◽

Thermal Cycling ◽

Damping Capacity ◽

Transformation Kinetics ◽

Burst Mode ◽

Martensite Content ◽

Nucleation Sites ◽

Ε Martensite

Effect of thermal cycling(γ↔ε) on γ→ε martensitic transformation kinetics and damping capacity of Fe-17mass%Mn alloy has been studied. The amount of ε martensite increases with thermal cycling in spite of decrease in Ms temperature. The increase in ε martensite content with thermal cycling is attributable to an increase in the density of martensite nucleation sites by introduction of dislocations during thermal cycling. The γ→ε martensitic transformation kinetics shows a burst mode in the non-cycled specimen, while the kinetics exhibits a sigmoidal mode in the cycled specimens. The damping capacity of the alloy increases with increasing the ε martensite content in the non-cycled specimen. On the contrary, the damping capacity of the alloy decreases with increasing the ε martensite content in the cycled specimens. The reason is that the dislocations introduced during thermal cycling, which obstruct the movement of the damping sources, become more with thermal cycling.

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