Improvement in the Shape Memory Response of Ti50.5Ni24.5Pd25 High-Temperature Shape Memory Alloy with Scandium Microalloying

被引：68

作者：

Atli, K. C. ^{[1
]}

Karaman, I. ^{[1
]}

Noebe, R. D. ^{[2
]}

Garg, A. ^{[2
]}

Chumlyakov, Y. I. ^{[3
]}

Kireeva, I. V. ^{[3
]}

机构：

[1] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA

[2] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

[3] Siberian Phy Tech Inst, Tomsk 634050, Russia

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2010年 / 41A卷 / 10期

关键词：

MARTENSITIC TRANSFORMATIONS; TI-NI; THERMODYNAMIC ANALYSIS; SITE PREFERENCE; PD; BEHAVIOR; CU; MICROSTRUCTURE; HYSTERESIS; ADDITIONS;

D O I：

10.1007/s11661-010-0245-z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A Ti50.5Ni24.5Pd25 high-temperature shape memory alloy (HTSMA) is microalloyed with 0.5 at. pct scandium (Sc) to enhance its shape-memory characteristics, in particular, dimensional stability under repeated thermomechanical cycles. For both Ti50.5Ni24.5Pd25 and the Sc-alloyed material, differential scanning calorimetry is conducted for multiple cycles to characterize cyclic stability of the transformation temperatures. The microstructure is evaluated using electron microscopy, X-ray diffractometry, and wavelength dispersive spectroscopy. Isobaric thermal cycling experiments are used to determine transformation temperatures, dimensional stability, and work output as a function of stress. The Sc-doped alloy displays more stable shape memory response with smaller irrecoverable strain and narrower thermal hysteresis than the baseline ternary alloy. This improvement in performance is attributed to the solid solution hardening effect of Sc.

引用

页码：2485 / 2497

页数：13

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