Functionally Graded Ti-50.5Ni Alloy
来源期刊：材料科学与工程学报2007年第6期
论文作者：Tae-Hyun Nam Yinong Liu Ju-Young Choi Hyun-Gon Kim Cha-Yong Lim Jung-Moo Lee Suk-Bong Kang
关键词：Ti-50.5Ni alloy; TGA treatment; dislocations; precipitates; temperature dependence of elongation;
摘 要：Transformation behavior and shape memory characteristics of a temperature gradient annealing(TGA) treated Ti-50.5Ni(at%) alloyhave been investigated by means of differential scanning calorimetry(DSC) and thermal cycling tests under constant load. By annealing the specimen under the temperature gradient from 823 K to 658 K after solution treatment, the B19' martensitic transformation start temperature changed by 60 K along the length of sample (150mm). Temperature dependence of transformation elongation (dε/dT) of the TGA treated wire was found to be 0.16 %/K. By annealing the specimen under the temperature gradient from 823 K to 658 K after 47 % cold working without solution treatment, the B19' martensitic transformation start temperature changed by 61K along the length of sample(150mm). Temperature dependence of transformation elongation (dε/dT) of the TGA treated wire was found to be 0.04 %/K. The large decrease in dε/dT by cold working effect suggested that an introduction of dislocation was more effective than precipitates for lowering dε/dT.
Tae-Hyun Nam1，Yinong Liu2，Ju-Young Choi1，Hyun-Gon Kim1，Cha-Yong Lim3，Jung-Moo Lee3，Suk-Bong Kang3
(1.Division of Advanced Materials Engineering, i-cube center and ERI, Gyeongsang National University,900 Gajwa-dong, Jinju, Gyeongnam 660-701, Korea;
2.Department of Mechanical Engineering, University of Western Australia, Crawley, WA 6009, Australia;
3.Advanced Materials Research Division, Korean Institute of Machinery and Materials, 66 Sangnam-dong, Changwon 641-831, Korea)
摘要:Transformation behavior and shape memory characteristics of a temperature gradient annealing(TGA) treated Ti-50.5Ni(at%) alloyhave been investigated by means of differential scanning calorimetry(DSC) and thermal cycling tests under constant load. By annealing the specimen under the temperature gradient from 823 K to 658 K after solution treatment, the B19'' martensitic transformation start temperature changed by 60 K along the length of sample (150mm). Temperature dependence of transformation elongation (dε/dT) of the TGA treated wire was found to be 0.16 %/K. By annealing the specimen under the temperature gradient from 823 K to 658 K after 47 % cold working without solution treatment, the B19'' martensitic transformation start temperature changed by 61K along the length of sample(150mm). Temperature dependence of transformation elongation (dε/dT) of the TGA treated wire was found to be 0.04 %/K. The large decrease in dε/dT by cold working effect suggested that an introduction of dislocation was more effective than precipitates for lowering dε/dT.
关键词:Ti-50.5Ni alloy; TGA treatment; dislocations; precipitates; temperature dependence of elongation;
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