✦ LIBER ✦

Temperature dependence of the damping properties of Ni–Mn–Ga alloys

✍ Scribed by I. Aaltio; M. Lahelin; O. Söderberg; O. Heczko; B. Löfgren; Y. Ge; J. Seppälä; S.-P. Hannula

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 504 KB
Volume: 481-482
Category: Article
ISSN: 0921-5093
DOI: 10.1016/j.msea.2006.12.229

No coin nor oath required. For personal study only.

✦ Synopsis

Single-crystalline 5M (exhibiting magnetic shape memory effect) and non-modulated martensitic Ni-Mn-Ga alloys were studied by dynamic mechanical analysis (DMA) at different temperatures. The chemical compositions of the alloys were determined using energy-dispersive X-ray spectrometry in a scanning electron microscope. The crystal structures were confirmed with X-ray diffraction and the transformation temperatures were measured. DMA measurements showed that the mechanical modulus (stiffness) and damping capacity increased during heating and a clear peak of the loss angle, was detected which is related to the reverse phase transformation of martensite to austenite. During cooling, there is a corresponding peak related to the martensite reaction. Significant decrease of the damping capacity occurs during transformation to austenite. Enhanced damping in the martensitic phase can be attributed to the mobility of twin boundaries.

📜 SIMILAR VOLUMES

ChemInform Abstract: Low Temperature Cry

ChemInform Abstract: Low Temperature Crystal Structure of Ni—Mn—Ga Alloys.

✍ B. Wedel; M. Suzuki; Y. Murakami; C. Wedel; T. Suzuki; D. Shindo; K. Itagaki 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 31 KB 👁 2 views

Effect of the selected alloying on Ni–Mn

Effect of the selected alloying on Ni–Mn–Ga alloys

✍ O Söderberg; K Koho; T Sammi; X.W Liu; A Sozinov; N Lanska; V.K Lindroos 📂 Article 📅 2004 🏛 Elsevier Science 🌐 English ⚖ 212 KB

Structure of the layered martensitic pha

Structure of the layered martensitic phases of Ni–Mn–Ga alloys

✍ J. Pons; R. Santamarta; V.A. Chernenko; E. Cesari 📂 Article 📅 2006 🏛 Elsevier Science 🌐 English ⚖ 673 KB

The present work contains a high-resolution transmission electron microscopy study (including image simulations) of the layered martensitic structures formed in Ni-Mn-Ga alloys. The main purpose is to distinguish two structural models proposed in the literature. For the seven-layered martensite, the

High-damping properties of Mn–Cu sintere

High-damping properties of Mn–Cu sintered alloys

✍ Mikio Fukuhara; Fuxing Yin; Yoshiaki Ohsawa; Susumu Takamori 📂 Article 📅 2006 🏛 Elsevier Science 🌐 English ⚖ 720 KB

The mechanical damping of manganese-rich Mn-Cu sintered alloys were investigated and compared to that of M2052 cast alloy. The damping of the sintered alloys consisting of ␣-Mn and ␥-MnCu phases is of the order of 10 -1 and insensitive to the frequency and temperature. Single phase ␥-MnCu alloys, pr

Structure dependence of optical spectra

Structure dependence of optical spectra of ferromagnetic Heusler alloy Ni–Mn–Ga

✍ J.F. Wan; J.N. Wang 📂 Article 📅 2005 🏛 Elsevier Science 🌐 English ⚖ 239 KB

The influence of structural transformation on the optical properties of Heusler alloy Ni-Mn-Ga has been investigated by using Density Functional Theory code CASTEP. The calculated optical refractive and absorption spectra, the off-diagonal components of the dielectric function and the optical conduc

Temperature dependence of rearrangement

Temperature dependence of rearrangement of martensite variants by magnetic field in 10M, 14M and 2M martensites of Ni–Mn–Ga alloys

✍ Nariaki Okamoto; Takashi Fukuda; Tomoyuki Kakeshita 📂 Article 📅 2008 🏛 Elsevier Science 🌐 English ⚖ 155 KB

We have examined the condition for the rearrangement of martensite variants (RMV) by magnetic field in a wide temperature range for three types of Ni-Mn-Ga ferromagnetic shape memory alloys: a Ni 2 MnGa with the 10M martensite, a Ni 2.02 Mn 1.09 Ga 0.89 (at.%) with the 14M martensite and a Ni 2.14 M