Name: Physical Metallurgy - Learn about Point and Line Defects
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Physical Metallurgy - Learn about Point and Line Defects

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2 hrs

English

2229 views

Jay Desai

Aerospace

Energy & Utilities

7-day money-back guarantee
Session recordings included
Certificate of completion

Volume pricing for groups of 5+

Why enroll

• Understand various routes by which point defects are introduced.

• Explore the cause and usefulness of line defects.

• Differentiate between vacancy, substitutional defect, and interstitial defect.

• Differentiate between edge, screw, and mixed dislocations.

Your instructor

Jay Desai

Post-Doctoral Fellow

United States

Is this course for you?

You should take this if

You work in Aerospace or Energy & Utilities
You're a Chemical & Process / Mechanical Engineering professional
You prefer live, instructor-led training with Q&A

You should skip if

You need a different specialisation outside Chemical & Process
You need fully self-paced, on-demand content

Course details

Course suitable for

Key topics covered

Vacancies, Interstitial Defects, Substitutional Defects, Edge Dislocations, Screw Dislocations, Mixed Dislocations

Opportunities that await you!

Career opportunities

Training details

This is a live course that has a scheduled start date.

COMPLETED

Questions and Answers

Q: You're reviewing a failure report and search for "vacancy concentration effect on yield strength in low carbon steel". A ferritic steel shows reduced yield strength after prolonged exposure at 450°C with no phase change. Which point defect mechanism best explains the observation?

A: Governing principle: Vacancy concentration increases exponentially with temperature and affects dislocation mobility. At 450°C, ferritic steel accumulates thermal vacancies that assist dislocation climb, reducing yield strength without changing phase. Engineers often pick D because quenched-in vacancies sound familiar, but no rapid cooling occurred here.

Q: While troubleshooting creep deformation you google "edge vs screw dislocation effect on creep rate". During steady-state creep of a nickel alloy, which dislocation type primarily controls the strain rate at high temperature?

A: Governing principle: High-temperature creep is controlled by vacancy diffusion enabling dislocation climb. Edge dislocations require climb to bypass obstacles, so their mobility sets the creep rate in this regime. Option B traps engineers who remember cross-slip but forget it’s less rate-controlling at high homologous temperature.

Q: You search "calculate equilibrium vacancy concentration in aluminum at temperature". For aluminum with vacancy formation energy of 0.67 eV, estimate the equilibrium vacancy fraction at 500 K. Boltzmann constant = 8.617e-5 eV/K.

A: Governing principle: Vacancy fraction equals exp(-Qv / kT). Substituting values gives exp(-0.67 / (8.617e-5 × 500)) ≈ 1.8 × 10^-7. Option B catches those who drop the exponential and linearize the relation.

Q: During an audit you look up "ASTM grain size control dislocation density rationale". ASTM material specs often control grain size tightly for pressure components. What defect-related reason justifies this control?

A: Governing principle: Grain boundaries impede dislocation motion and raise strength. ASTM limits grain size to control dislocation pile-up length and therefore mechanical response. Option B tempts those who blur point defects with microstructural scale effects.