In-situ SEM study of temperature dependent tensile behavior of wrought molybdenum

► Unixial tension tests were conducted in-situ with the SEM observations. ► In-situ SEM observations reveal the slip bands evolution, grain deformation, and crack formation. ► The stress- strain curves are obtained at a temperature range of 300-750 °C. ► Formation of cleavage crack via slip is experimentally illustrated. ► The fracture mechanisms for the wrought molybdenum are provided.