Effect of aging and solution annealing on transformation and deformation mechanism of super-elastic Ni50.9%-Ti alloy in nano scale
Effect of aging and solution annealing on transformation and deformation mechanism of super-elastic Ni50.9%-Ti alloy in nano scale
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效果%20of%20时效%20and%20固溶%20退火%20on%20转变%20and%20变形%20机制%20of%20超弹%20Ni50.9%-Ti%20合金%20in%20纳米%20规模
DOI：
10.1051/esomat/200902009
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发表时间：
2009
影响因子：
3.6
通讯作者：
S. Hannula
中科院分区：
文献类型：
--
作者：
A. Ghabchi;J. Khalil;Xuwen Liu;O. Söderberg;E. Turunen;S. Hannula
利用纳米压痕仪在纳米尺度上研究了时效和固溶退火处理对冷加工Ni50.9%-Ti细线超弹性响应的影响。纳米压痕结果与拉伸测试结果相结合，可以更好地了解控制变形机制。第一次热处理、冷加工线材拉伸试验和纳米压痕结果显示，第二次处理的线材具有更好的超弹性行为。两种处理后的加载过程中均观察到压痕位移爆发。然而，在第二次热处理后记录了压痕卸载过程中的斜率变化，这可能是由于逆相变造成的。通过原子力显微镜在远离压痕应力场的地方观察到第一次处理后的后压痕表面上的表面粗糙度。
Effects of aging and solution annealing treatment on the super elastic respond of the cold-worked Ni50.9%-Ti thin wire was studied in nano-scale utilizing instrumented nanoindentation. The nanoindentation results were coupled with the tensile test results to provide better insight to the governing deformation mechanisms. The first applied heat treatment heat treatment the cold-worked wire tensile test and nanoindentation results showed better super elastic behavior for the wire subjected to second treatment. Indentation displacement bursts were observed in loading course after both treatments. However, slope changes in unloading course of indents were recorded after second heat treatment which might be due to reverse phase transformation. Surface asperities on the post-indented surface after first treatment were observed far away from indentation stress field by atomic force microscopy.