抄録
Thermal expansion within a temperature range of −150°∼900°C and Young’s modulus within a temperature range of −150°∼700°C and the rigidity modulus at room temperature of Fe–Cr alloys containing 0∼59.10% chromium have been measured. It has been found that the mean linear coefficient of thermal expansion at 0°∼40°C show minimum values of 9.94×10−6 and 10.60×10−6 in the annealed alloys containing 19.90% and 54.10% chromium, respectively, thereby revealing the Invar property. Fe–Cr alloys with a concentration range of about 17∼39% chromium exhibit the Elinvar property, the highest transition temperature being 230°C in an alloy containing nearly 25% chromium. The negative minimum value of the temperature coefficient of Young’s modulus at 0°∼40°C is −6.81×10−5 in an alloy containing 19.43% chromium. The Elinvar property is also observed in the Fe-54.10% Cr alloy with a negative minimum value of −9.60×10−5 at 0°∼40°C.
