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Low-temperature deform ation of body-centred cubic metals I. Yield and How stress m easurements B y J. W. Ch r is t ia n a n d B . C. M a s t e r s * Measurements of the tensile yield stress and of the temperature and strain-rate sensitivity of the flow stress are reported for single crystals of niobium and for polycrystalline speci mens of niobium, vanadium and tantalum over the temperature range 4*2 to 373 °K. The temperature dependences of yield and flow stresses are nearly identical, anddoi:10.1098/rspa.1964.0179 fatcat:mpzzvcvpafcbnphnkenknvcuvu