On　Earth,　high-speed　rotating　blades　and　rotors　experience　hypergravity,　which　is　mainly　derived　from　centrifugal　force.　Aluminum　alloys　are　widely　used　in　high-speed　rotating　machines.　In　particular,　7075　aluminum　has　excellent　properties,　providing　it　with　great　potential　for　application　in　high-temperature　rotating　parts.　In　this　work,　the　cracking　behavior　and　microstructural　evolution　characteristics　of　high-speed　rotating　blades　under　different　stresses　were　studied.　A　specifically　designed　instrument　and　blades　with　multiple　necks　were　assembled,　and　the　stress　was　tuned　by　adding　weight　to　the　blade　tip.　Each　rotating　blade　cracked　on　its　root　neck,　indicating　that　the　gradient　hypergravitational　force　decreased　from　the　root　to　the　tip.　The　degree　of　high-temperature　cracking　obviously　increased　with　a　sawtooth-like　tip,　but　the　degree　of　low-temperature　cracking　did　not　obviously　increase　with　a　smooth　tip.　A　comparison　under　a　constant　uniaxial　force　required　a　greatly　increased　ultimate　cracking　strength　that　was　approximately　10–18　times　greater　than　that　under　hypergravitational　force　at　the　same　temperature.　Force　analysis　indicated　that　the　coupling　of　hypergravitational　forces　in　the　normal　direction　and　torsional　forces　in　the　tangential　direction　accelerated　cracking.　A　uniaxial　force　caused　grains　to　extend　along　the　blade　direction.　However,　a　tangential　force　cut　these　extended　grains　to　accelerate　cracking　and　grain　refining.　In　this　study,　real-world　simulated　service　conditions　for　commercial　alloys　rotating　at　high　speeds　and　a　new　understanding　of　the　mechanical　properties　of　alloys　under　various　severe　conditions　were　provided.　©　2024　The　Authors