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What are eutectic and peritectic alloys?

Both, eutectic and peritectic alloys consist of three phases: two solid phases which we will denote α and β as well as a liquid phase. In a peritectic system, beneath the peritectic temperature, just one of the solid phases is formed from the other solid phase and the liquid, e.g., L+α→β.

What is eutectic phase diagram?

The binary eutectic phase diagram explains the chemical behavior of two immiscible (unmixable) crystals from a completely miscible (mixable) melt, such as olivine and pyroxene, or pyroxene and Ca plagioclase.

What is a Peritectoid reaction?

Peritectoid. A peritectoid transformation is a type of isothermal reversible reaction that has two solid phases reacting with each other upon cooling of a binary, ternary., n-ary alloy to create a completely different and single solid phase.

What is peritectic reaction example?

DEF. A peritectic reaction is a three-phase reaction by which, on cooling, two phases (one of them liquid) react to give a single new solid phase. Liquid + solid α → solid β . The composition of the β which forms (in this example) is 50 at% B.

What is a Peritectoid?

What is the eutectoid point?

The location on a phase diagram indicating the eutectoid composition and eutectoid temperature of an alloy. The eutectoid point also indicates the location at which three solid phases co-exist. In the iron-carbon phase diagram, this point indicates a temperature of 1333 F and a carbon content of 0.8%.

What is peritectic alloy?

Peritectic reaction, in which the primary phase reacts with a liquid phase at a triple junction on cooling to produce the peritectic phase, is observed in many binary alloys systems, such as Ti-Al, Fe-Co, Fe-Ni, etc1,2,3. Peritectic reaction terminates once the primary phase is enwrapped by the peritectic phase.

What is a peritectic reaction?

A peritectic reaction is a reaction where a solid phase and liquid phase will together form a second solid phase at a particular temperature and composition – e.g. Diagram showing the Peritectic reaction, where a liquid and solid together form a new solid phase.

What is meant by peritectic and Peritectoid reactions?

In binary systems, the peritectoid is the transformation of two solid phases in an alloy system, forming a new phase. These reactions happen in a similar way to peritectic transformations (see Peritectic), however, they only occur in the solid state.

What does the diagram of the eutectoid mean?

Eutectoid Phase diagram Eutectic name itself means quick melting, the diagram gives us information of a two alloying elements with dissimilar sizes and crystal structures. Basically various phases are formed here due to different crystal structure.

How are peritectoids and peritectics the same?

As the name suggests, a peritectoid is similar to a peritectic but just a little bit different. At a peritectoid point, upon heating, a single phase solid will decompose into two different solid phases, unlike a peritectic, where the solid phase decomposes into a different solid and a liquid phase.

What does the name eutectic mean in crystal structure?

Eutectic name itself means quick melting, the diagram gives us information of a two alloying elements with dissimilar sizes and crystal structures. Basically various phases are formed here due to different crystal structure.

Which is the eutectic point in a phase diagram?

On a phase diagram, the eutectic temperature is seen as the eutectic point (see plot on the right). Non-eutectic mixture ratios would have different melting temperatures for their different constituents, since one component’s lattice will melt at a lower temperature than the other’s.