Jo Sharp - Lecture 12 - Ti-alloys

Anton Permyakov
Quiz by Anton Permyakov, updated more than 1 year ago
Anton Permyakov
Created by Anton Permyakov over 2 years ago
4
1

Description

Undegraduate 2nd Year MAT2320 Quiz on Jo Sharp - Lecture 12 - Ti-alloys, created by Anton Permyakov on 05/17/2018.

Resource summary

Question 1

Question
Drag and drop the names of Ti phases: Beta : [blank_start]........[blank_end] Alpha: [blank_start]........[blank_end]
Answer
  • BCC
  • HCP
  • FCC

Question 2

Question
If you cool fast enough from β (bcc), Ti will do a sudden diffusionless/martensitic transition (like steel does) but to a hexagonal phase called α’.
Answer
  • True
  • False

Question 3

Question
Drag and drop the names of the four broad classes of alloying elements for Ti: • [blank_start]Alpha[blank_end] stabilisers – cumulative effect expressed as Al equivalent • Isomorphous [blank_start]beta[blank_end] stabilisers • Eutectoid beta stabilisers – cumulative effect of both kinds of beta stabilisers together is expressed as Mo equivalent • Elements that don’t stabilise either phase more than the other but provide solid solution hardening (sticky places to hold dislocations etc, like in lecture 2) – these are Zr, Sn, Si.
Answer
  • Alpha
  • Beta
  • gamma
  • beta

Question 4

Question
Drag and drop the types of stabilising elements above each diagram:
Image:
Stablies
Answer
  • Alpha stabilising elements for Ti
  • Beta stabilising elements for Ti

Question 5

Question
Microstructure develops as [blank_start]α[blank_end] nucleates and grows on [blank_start]β[blank_end] grain boundaries and then grows in to take over the inside of the grain. What you get depends strongly on two parameters: • [blank_start]Grain[blank_end] [blank_start]size[blank_end] of the β before we started cooling (prior β grain size) • [blank_start]Cooling[blank_end] [blank_start]rate[blank_end], both initially and after any heat treatments you do to it.
Answer
  • α
  • β
  • Grain
  • size
  • Cooling
  • rate

Question 6

Question
When we fracture Ti-alloy, the crack that will lead to its failure initiates on and propagates along the long bits of α on the grain boundaries
Answer
  • True
  • False
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