01 / FoundationAim & Learning Objectives
Aim
To develop an understanding of how atomic bonding and crystal structure influence the mechanical properties and performance of engineering materials — with direct reference to materials specified across HS2 Phase 1 between London Euston and the West Midlands.
Learning Objectives
- 1Understand the different types of atomic bonding and their influence on material behaviour.
- 2Describe common crystal structures found in engineering materials.
- 3Explain how deformation and strengthening mechanisms affect material performance.
- 4Recognise the importance of bonding and crystal structure in controlling engineering properties such as strength and ductility.
02 / PersonaliseChoose your HS2 material of focus
Every quiz question, the final stage challenge, and your downloadable assessment will be tailored to the material you select. Choose carefully — you can only pick one.
03 / SimulateBonding & Crystal Lattice Lab
Bond Type
Bond strengthHigh
Electron mobilityFree (sea)
DuctilityHigh
HS2 exampleSteel rail
Metallic bonding
A delocalised "sea" of electrons holds positive ion cores together — explains why HS2 rails plastically deform under stress rather than shattering.
04 / VisualiseCrystal structures — BCC, FCC, HCP
Lattice
Atoms per cell2
Coordination8
Packing factor0.68
Slip systems48 (limited)
HS2 useRail steel (α-Fe)
Body-Centred Cubic (BCC)
α-iron and ferritic steels adopt BCC. Strong but less ductile than FCC at room temperature — relevant to cold-weather brittleness of older rail steels.
05 / Play & Learn5-stage materials gauntlet
Stage 01
Bond Match
Stage 02
Build a Lattice
Stage 03
Slip the Plane
Stage 04
Strengthen It
Stage 05
HS2 Final