کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1450708 | 988743 | 2005 | 13 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of grain size and texture on pseudoelasticity in Cu–Al–Mn-based shape memory wire Effect of grain size and texture on pseudoelasticity in Cu–Al–Mn-based shape memory wire](/preview/png/1450708.png)
The effect of the relative grain size d/D (d: grain size, D: wire diameter) on stress–strain characteristics was investigated in Cu–Al–Mn-based shape memory alloy (SMA) wires. The yield stress (σy), the work-hardening rate after yielding (dσPE/dε) and the stress hysteresis (Δσ) in the wires with a random texture decrease with increasing d/D. The transformation strain (εTS) and the maximum pseudoelastic strain (εPEMAX) increase with increasing d/D. The effect of grain size on pseudoelastic behaviors can be clarified from the volume fraction of three-dimensionally constrained grains and the σy, dσPE/dε and Δσ increase proportionally with increasing (1 − (d/D))2 while the εTS decreases proportionally with increasing (1 − (d/D))2. Consequently, the effect of grain size on the pseudoelastic behaviors can be expressed using the Taylor and inverse Schmid factors. The σy and the εTS for wires with a 〈1 1 0〉 fiber texture are larger and smaller than those for wires with a random texture, respectively.
Journal: Acta Materialia - Volume 53, Issue 15, September 2005, Pages 4121–4133