Journal ArticleDOI
Influence of quenching methods on martensitic transformation and mechanical properties of P/M processed Cu–Al–Ni–Ti shape memory alloys
Reads0
Chats0
TLDR
In this paper, the effect of quenching conditions on phase transformation characteristics and microstructural features of shape memory alloys (SMAs) were studied using FE-SEM and XRD techniques.Abstract:
The effect of quenching conditions on phase transformation characteristics and microstructural features of Cu–Al–Ni–Ti shape memory alloys (SMAs) have been studied. The alloys were synthesised via conventional powder metallurgy process using elemental metal powders. Four different quenching techniques, such as (a) two-step quenching, first to 100°C and then to 0°C; (b) two-step quenching, initially to 40°C and later to 0°C; (c) direct quenching to 40°C and (d) direct quenching to 0°C, were used. The microstructural features and phase transformations that the alloys had undergone were studied using FE-SEM and XRD techniques. The martensitic phase transformation analyses were carried out by differential scanning calorimeter while the mechanical properties were studied by microhardness and flexural bending tests. The results obtained clearly indicate that the quenching routes followed have a remarkable influence on the properties of Cu-based SMAs.read more
Citations
More filters
On the stability of the bcc phase in Cu-Al-Mn shape memory alloys
TL;DR: In this article, the authors measured the entropy change at the martensitic transition of two composition-related sets of shape-memory alloys and found that most of the change has a vibrational origin, and depends only on the particular close-packed structure of the low-temperature phase.
Journal ArticleDOI
Microstructure and mechanical properties of Cu–12Al–xNi alloy prepared using powder metallurgy
Zhenghua Deng,Haiqing Yin,Cong Zhang,Guofei Zhang,Wanquan Li,Tong Zhang,Ruijie Zhang,Xue Jiang,Xuanhui Qu +8 more
TL;DR: In this paper, the effect of nickel content on the microstructure and mechanical properties of Cu-12Al-xNi alloys prepared using powder metallurgy was investigated, and the NiAl phase precipitated at the grain boundaries, which resulted in an increase in the strength of the alloy.
Journal ArticleDOI
Effects of alloying, heat treatment and nanoreinforcement on mechanical properties and damping performances of Cu–Al-based alloys: A review
Journal ArticleDOI
An investigation on the properties of boron modified Cu-Al-Be polycrystalline shape memory alloys
TL;DR: In this article, the effect of microalloying of boron (B) i.e., 0.02-0.15% and the variation of composition of Al and Be from 11.3 to 11.44% respectively, has been investigated on the grain refinement and shape memory properties of polycrystalline Cu-Al-Be shape memory alloy.
Journal ArticleDOI
In-situ TEM analysis of the phase transformation mechanism of a Cu-Al-Ni shape memory alloy
Tae-Hoon Kim,Gaoyuan Ouyang,Jonathan D. Poplawsky,Matthew J. Kramer,Valery I. Levitas,Jun Cui,Jun Cui,Lin Zhou +7 more
TL;DR: In this article, two distinct phase transformation (PT) mechanisms for shape memory alloy (SMA)-based devices were revealed by in-situ TEM observation, where a growth-dominant conventional PT mechanism showed in the fast quench sample, whereas a nucleationdominant PT mechanism that suppresses interface propagation and induces high thermal hysteresis displays in the slow quen sample.
References
More filters
Journal ArticleDOI
The Deformation and Ageing of Mild Steel: III Discussion of Results
TL;DR: In this paper, an attempt is made to explain the observed phenomena in the yielding and ageing of mild steel, described in two previous papers, in the general terms of a grain-boundary theory.
Journal ArticleDOI
On the thermodynamics of thermoelastic martensitic transformations
R.J. Salzbrenner,Morris Cohen +1 more
TL;DR: In this paper, both elastic strain energy due to the transformational shape change and frictional resistance opposing interfacial motion are shown to contribute significantly to the observed thermodynamic changes which accompany thermoelastic martensitic transformations in Cu-14 Al-2.5 Ni alloys.
Journal ArticleDOI
Effect of grain size and texture on pseudoelasticity in Cu–Al–Mn-based shape memory wire
TL;DR: In this article, the effect of grain size on pseudoelastic behaviors was investigated in shape memory alloy (SMA) wires, and the Taylor and inverse Schmid factors were expressed using the volume fraction of three-dimensional constrained grains.