Corrosion Behavior of Cu-Zn-Ni Shape Memory Alloys

Abstract

Four shape memory alloys of Cu-Zn-Ni, in the range of 35 -55 wt% of Cu, 43 -60 wt% Zn and 2 -9 wt% Ni, were prepared by ingot metallurgy route in an induction furnace under an inert atmosphere. The shape memory effect was tested by bend test. The alloys were further tested for its corrosion behavior in fresh water, Hank's solution and sea water. From the results it was observed that the alloys exhibit high corrosion resistance in fresh water when compared to Hank's solution and sea water. And it was also observed that the alloys exhibit better corrosion resistance in Hank's solution than in sea water.

Study the X-ray attenuation for a voltage range (20-35)Kv for copper-based smart alloys by adding silver and micro-particles

“…Silver for alloy (B1) to alloy (B5), when comparing the results of silver content (5%) (Micro and Nano particle), it was found that the linear attenuation coefficient of alloy (B5) increases compared to the linear attenuation of alloy (C5) due to the silver content ( Nano particle) compared with the sizes of the particles of the elements constituting the alloy, as the voids are filled and the inter-atomic spaces are reduced, which leads to an increase in the practical density and hardness and a decrease in porosity. Figure (14) show the direct relationship between the mass attenuation coefficient and the silver content of the alloys (C1, C2, C3, C4, C5), as the mass attenuation coefficient increases by (33.5%) when the silver content is increased from (1-5)% to the effect of silver particles Its role is to fill in the blanks.…”

“…Some copper alloys are designed for use in safety and protection devices to stop the flow of toxic or flammable gases and have also been used in structural or The semi-structure to improve its resistance in addition to its use in the connections designated for air conditioning systems for its ability to remember the shape when heated to high temperatures and return to its original shape after cooling. The basis of this effect is the transformation of alloys from the martensite phase to the austenite phase [14,15].…”

Effect of Elements (Mo, Zr) on a Copper-Based Alloy to Attenuate X-Rays

“…Shape memory alloys (SMAs) have wide applications in thermal sensors, protection devices, medical devices, and others due to their unique properties such as Super Elasticity, and the shape memory effect (SMAs), and to improve their properties, limited quantities of some alloying elements are added to them individually or jointly. The basis of the effect is the transformation of the alloys from the martensite phase to another austenite phase when it is heated to high temperatures and returned to its original shape after cooling, [15,16].…”

Corrosion behavior of heat treatment Cu-Al-Be shape memory alloy in simulation body fluid

“…In realistic applications, as the alloy is exposure to corrosion solution for a period of time they are exhibit to corrosion and pitting, for that reason study of corrosion behaviour like corrosion current and potential and pitting potential of the alloys are require to be done before they are put into biomedical and industrial applications. Since SMAs find a wide application in the marine, aerospace applications and it is also used in the surgical medical use such as guide wire, so it becomes necessary that the shape memory alloys high corrosion resistance to the environment in which it is being used, so it is important to evaluate the corrosion behaviour of the SMAs [11][12][13][14] .…”