Recovery of microindents in a nickel-titanium shape-memory alloy: A "self-healing" effect
Recovery of microindents in a nickel-titanium shape-memory alloy: A "self-healing" effect
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DOI：
10.1063/1.1476064
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发表时间：
2002-05-06
影响因子：
4
通讯作者：
Grummon, DS
中科院分区：
文献类型：
--
作者：
Ni, WY;Cheng, YT;Grummon, DS
研究了镍钛形状记忆合金微观形变的热致回复。用球头和锥头在室温下将合金压入马氏体相，模拟了合金的表面变形。我们发现，球状微压痕中的变形可以通过适度的加热几乎完全逆转。Vickers压痕形成的锥体压痕部分恢复，且恢复率与压痕深度无关。使用球形和锥形压头下的代表性应变和最大应力的概念使观测结果合理化。(C)2002年美国物理研究所。
The thermally induced recovery of microscopic deformation in a nickel-titanium shape-memory alloy was examined. Surface deformation was simulated by indenting the alloy in the martensite phase at room temperature using both spherical and pyramidal indenters. We show that deformation in spherical microindents can be almost completely reversed by moderate heating. Partial recovery was observed for pyramidal impressions formed by a Vickers indenter and the recovery ratio was independent of the indentation depth. The observations were rationalized using the concept of representative strain and maximum stress under the spherical and pyramidal indenters. (C) 2002 American Institute of Physics.