초록

온도가 상승함에 따라 특이하게 강도의 증가를 나타내는 L1?형 규칙합금에 대한 연구자료들을 분석하였다. L1?형 규칙합금 중에서도 합금종류에 따라 나타나는 고온 소성거동의 유사성과 차이점을 지적하고 종합적인 의견을 제시하였다. 고온압축강도 시험에 의하여 천이금속원소인 Zr, Hf, Nb, Ta을 첨가한 Ni?(Al.X)합금의 항복강도를 구하였다. 각각의 제 3원소의 첨가로 최대강도 이하의 모든 온도에서 유동응력은 현저하게 증가하였으며, Kear-Wilsdorf 기구에 필요한 활성화 에너지는 감소되었다.

Abstract ▼

A review of the available data on the anomalous yield strength increase with in creasing temperature of Ll? ordered alloys is presented. The similarities and differences in the flow stress behavior of different Ll? alloys is pointed out and then a more general, unified view of the physical basis for

A review of the available data on the anomalous yield strength increase with in creasing temperature of Ll? ordered alloys is presented. The similarities and differences in the flow stress behavior of different Ll? alloys is pointed out and then a more general, unified view of the physical basis for the observed anomalies is presented. Compressive yield stress measurements at elevated tempertures have been made on ternary Ni?(Al.X) compounds with additions of transition metal elements, Zr, Hf, Nb and Ta. With additions of every ternary element, the flow stress level at test temperatures below the peak increases drastically, and the activation energy for the Kear-Wilsdorf mechanism is reduced.