1 / 10

Pb – Sn PHASE DIAGRAM

Pb – Sn PHASE DIAGRAM. EXPERIMENT # 9 Instructor: M.Yaqub. SOLUTION. Solid solution : Consists of atoms of at least two different types Solute  an element or compound present in a minor concentration Solvent  an element or compound in greater amount; host atoms.

roy
Télécharger la présentation

Pb – Sn PHASE DIAGRAM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pb – Sn PHASE DIAGRAM EXPERIMENT # 9 Instructor: M.Yaqub

  2. SOLUTION • Solid solution: Consists of atoms ofat least twodifferent types • Solute an element or compound present in a minor concentration • Solvent  an element or compound in greater amount; host atoms. • Solubility Limit: The maximum concentration of a solute atoms that may dissolve in the solvent to form a solid solution at some specific temperature.

  3. PHASE • Phase:defined as a homogeneous portion of a system that has uniform physical and chemical characteristics. • Everypure materialis considered to be a phase • Also every solid, liquid, and gaseous solution • e.g., syrup solution is one phase, and solid sugar is another

  4. PHASE DIAGRAM • Equilibrium Phase diagram: • Represents the relationships between temperature and the compositions and the quantities of phases at equilibrium. • Also known as phase, equilibrium or constitutional diagram • Abinary alloyis one that contains two components.

  5. Pb – Sn PHASE DIAGRAM • a - Solid solution of tin in lead (tin “Sn” is solute and lead “Pb” is solvent) • Solubility limit is 18.3% at 183 oC • b - Solid solution of lead in tin (lead “Pb” is solute and tin “Sn” is solvent) • Solubility limit is 2.2% at 183 oC • Eutectic point at 61.9% Sn at 183 oC

  6. Pb – Sn PHASE DIAGRAM

  7. DIFFERENTIAL SCANNING CALORIMETR • Differential Scanning Calorimeter (DSC) is used to make a phase diagram. • Read the hand out for detail procedure.

  8. PLOT OF HEAT FLOW

  9. LAB REPORT • From the resultant DSC curves determine the following parameters: • Initial melting temperature for each sample. • Melting peak for each sample. • Final melting point for each sample. • Calculate the heat of fusion, which is the area under the curve between the solid and the dotted lines for each sample.

  10. LAB REPORT (Continue) • Plot the measured transition temperatures on the Pb-Sn phase diagram. • Tabulate all values for all tested specimens in a table format. • Estimate the mass fractions of each phase in the microstructure given below. • Predict the equilibrium mass fractions of each phase using the phase diagram and the lever rule.

More Related