Damping Capacity of Mg alloys and TiNiCu SMAs
Date Issued
2006
Date
2006
Author(s)
Chou, Ting-Yao
DOI
zh-TW
Abstract
Damping capacity of Ti51Ni49-XCuX（x：6~9at％）shape memory
alloys（SMAs）and magnesium alloys was studied. Ti51Ni41Cu8 and
Ti51Ni40Cu9 SMAs cold-rolled and annealed at 650℃×48h have the
significant transformation peaks at room temperature in which the tanδ
value can reach 0.14 at the cooling rate 3℃/min and frequency 1Hz.
After keeping isotherm at the peak temperature for 1h, the tanδ value of
Ti51Ni41Cu8 is still above 0.03. The B19→B19’ transformation peak
（20~25℃）of cold-rolled and annealed at 650℃×48h has its tanδ≧0.36
with the frequency 1~80Hz. In addition, the martensite phase of this
cold-rolled and annealed alloy Ti51Ni40Cu9 SMA increases its tanδ value
with the increasing amplitude and exceeds 0.08 with amplitude 50μm at
0℃. Cold-rolling and recrystallization annealing at 100℃can improve
tanδ values of AZ31 and pure magnesium at room temperature
（tanδ≧0.04）, but these effects are not obvious for Mg-9.5Li-0.5Zn
alloy. However, excellent damping capacity of 30 ％ cold-rolled
Mg-9.5Li-0.5Zn alloy can be obtained at high temperature（T＞150℃）
and is regarded as a result of the onset of grain boundary sliding and of α
/ β phase boundary sliding.
Subjects
鈦鎳銅形狀
記憶合金
鎂合金
制振能
冷
軋延
退火
TiNiCu shape memory alloys
Magnesium alloys
Damping
Type
thesis
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