Duplex　aluminum-titanium　alloys　are　extensively　utilized　in　aerospace　and　other　applications　due　to　their　superior　mechanical　properties　and　lightweight　potential.　However,　the　mechanisms　of　abrasion　and　defect　evolution　under　impact　vibration　friction　remain　unclear　and　require　in-depth　investigation.　This　paper　comparatively　studies　the　friction　behavior　and　wear　mechanisms　of　duplex　titanium　aluminide　alloys　under　impact　vibration　friction　and　conventional　linear　friction　via　molecular　dynamics　(MD)　simulations.　The　findings　indicate　that　the　average　total　force　on　the　workpiece　under　impact　vibration　friction　is　less　than　that　under　conventional　linear　friction,　but　the　friction　forces　of　both　increase　significantly　when　the　abrasive　ball　approaches　the　interface,　revealing　the　strengthening　influence　of　the　interface.　The　periodic　trajectory　of　impact-vibration　friction　results　in　uneven　wear　debris　accumulation　and　energy　distribution,　and　its　intermittent　shock　loading　promotes　the　dynamic　rearrangement　and　dense　arrangement　of　material　atoms,　which　enhances　deformation　resistance.　High-frequency　energy　inputs　result　in　a　higher　overall　temperature　level,　despite　the　greater　amplitude　of　temperature　fluctuations.　Further　analysis　reveals　that　the　two-phase　interface　forms　an　‘interface　strengthening-plasticity　regulation’　dual　mechanism　by　hindering　dislocation　motion　and　promoting　proliferation.　Impact　loads　significantly　activate　dislocation　sources,　resulting　in　a　dislocation　quantity　and　various　dislocation　densities　significantly　higher　than　those　in　conventional　linear　friction,　while　severe　plastic　deformation　promotes　amorphization　of　more　atomic　lattices.　©　2025　IOP　Publishing　Ltd.　All　rights,　including　for　text　and　data　mining,　AI　training,　and　similar　technologies,　are　reserved.