Strain　rate　effect　on　the　mechanical　behavior　of　a　Cu48Zr43Al4　bulk　metallic　glass　composite　(BMGC)　containing　a　B2-CuZr　phase　was　investigated　under　quasi-static　and　dynamic　compression.　It　was　found　that　the　CuZr-based　BMGC　exhibits　remarkable　strain-rate-softening,　although　the　deformation-induced　martensitic　transformation　of　the　B2-CuZr　phase　similarly　occurred　under　both　quasi-static　and　dynamic　loading.　The　significant　transformation-induced　plasticity　(TRIP)　and　pronounced　work-hardening　characteristic　of　the　BMGC　upon　quasi-static　loading　were　found　to　be　considerably　deteriorated　under　dynamic　loading.　Furthermore,　the　BMGC　alloy　was　aboratively　heat-treated　into　austenite　and　martensite　states　mainly　containing　the　B2-Car　phase　and　the　B19＇-CuZr　phase　respectively.　By　comparing　the　strain-rate　responses　of　the　mechanical　behaviors　in　the　austenite　and　martensite　states,　it　was　shown　that　the　B2-CuZr　phase　itself　presents　dynamic　softening　due　to　the　deformation-induced　martensitic　transformation　with　heat　release　effect.　The　dynamic　softening　characteristic　of　the　B2-CuZr　phase　limits　its　contribution　to　the　potential　mechanical　behavior　of　the　CuZr-based　BMGC　containing　the　B2-CuZr　phase　under　dynamic　loading.　(C)　2014　Elsevier　B.V.　All　rights　reserved.