摘要
时效处理是调节合金微结构,影响合金性能的有效方法。用实验的方法分析了Ni-Ti-La合金的微结构,研究了合金的相变行为,测定了合金的维氏硬度。实验结果表明,用La元素替代Ni元素形成的Ti_(50)Ni_(49.5)La_(0.5)合金,经时效处理后合金由NiTi基体、NiLa沉淀相和Ti_(2)Ni沉淀相组成,并且沉淀相的数量随着时效温度升高而减少,合金在加热和冷却的过程中均为一步相变B2↔B19',合金相变开始温度随时效温度的升高而增大,合金的硬度随时效温度的升高而增大。用La元素替代Ti元素形成的Ti_(49.5)Ni_(50)La_(0.5)合金,经时效处理后合金由NiTi基体、NiLa沉淀相组成,并且沉淀相的数量随时效温度的升高而增加,合金在加热和冷却的过程中呈现一步相变B2↔B19',相变开始温度随时效温度的升高而增大,合金的维氏硬度随时效温度的升高而减小。时效处理对Ti_(50)Ni_(49.5)La_(0.5)合金和Ti_(49.5)Ni_(50)La_(0.5)合金的微结构产生了影响,进而影响了合金的相变行为和力学性能。
Aging treatment is an effective method to adjust the microstructure of alloy and affect its properties.The microstructure of the Ni-Ti-La alloys was analyzed experimentally,the phase transformation behavior of the alloys was studied,and the Vickers hardness of the alloys was measured.The experimental results show that the Ti_(50)Ni_(49.5)La_(0.5) alloys are composed of NiTi matrix,NiLa precipitates and Ti_(2)Ni precipitates after aging treatment,and the amounts of precipitates decrease with the increase of aging temperature.The alloys undergo one-step phase transformation B2↔B19'during heating and cooling,and the martensitic transformation starting temperature of the alloy increases with the increase of aging temperature.The hardness of the alloys decreases with the increase of aging temperature.The Ti_(49.5)Ni_(50)La_(0.5) alloys are composed of NiTi matrix and NiLa precipitates after aging treatment,and the amounts of precipitates increase with the increase of aging temperature;The alloys present one-step phase transformation B2↔B19'during heating and cooling,and the martensitic transformation starting temperature of alloy increases with the increase of aging temperature.The Vickers hardness of the alloys decreases with the increase of aging temperature.As can be seen from the results,aging treatment affects the microstructures of Ti_(50)Ni_(49.5)La_(0.5) alloys and Ti_(49.5)Ni_(50)La_(0.5) alloys,thus affecting the phase transformation behavior and mechanical properties of the alloys.
作者
王晶
李维雅
赵春旺
WANG Jing;LI Weiya;ZHAO Chunwang(College of Science,Inner Mongolia University of Technology,Hohhot 010051,China;School of Materials Science and Hydrogen Energy,Foshan University,Guangdong Foshan 528000,China)
出处
《内蒙古工业大学学报（自然科学版）》
2024年第1期18-22,共5页
Journal of Inner Mongolia University of Technology：Natural Science Edition
基金
国家自然科学基金项目(51261017)
内蒙古自治区高等学校科学研究项目(NJZY20080)
内蒙古工业大学科学研究项目(BS201931)。
