研究生: |
羅元宏 Lo, Yuan-Hung |
---|---|
論文名稱: |
鐵鈀銦及鐵鈀金鐵磁性形狀記憶合金均質化處理之研究 Homogenization Study on FePd29.5In0.5 and FePd30-xAux Ferromagnetic Shape Memory Alloy Ribbons |
指導教授: |
胡塵滌
Hu, Chen-Ti |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 英文 |
論文頁數: | 92 |
中文關鍵詞: | 鐵磁性 、形狀記憶 、薄帶 、均質化 |
外文關鍵詞: | Ferromagnetic, Shape Memory, Ribbon, Homogenization |
相關次數: | 點閱:3 下載:0 |
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本論文中探討冷滾壓以及均質化處理對於快速凝固旋淬法製備的 FePd29.5In0.5 and FePd30-xAux (x = 1, 5 and 7) 鐵磁性形狀記憶合金薄帶在相變化溫度、磁性質、磁致伸縮與形狀記憶效應的影響。
初製成的FePd29.5In0.5試片中含有少量bct相,相同試片經過均質化處理之後則完全為bct相,而初製成以及均質化後的FePd30-xAux (x = 1, 5 and 7)試片則沒有觀察到bct相。 初製成的FePd30-xAux (x = 1, 5 and 7)薄帶Af溫度隨著Au的含量上升,而均質化後的薄帶Ms溫度隨著Au的含量下降。 在室溫下FePd23Au7為母相。
初製成FePd29.5In0.5試片比均質化處理的試片有較高的室溫飽和磁化量,但是矯頑磁場較小。 而FePd30-xAux (x = 1, 5 and 7)試片不論是初製成或者是均質化後的室溫飽和磁化量都隨著Au的比例而下降。 磁致伸縮值方面,初製成FePd29.5In0.5薄帶在與9 kOe的磁場方向呈80度夾角時有375ppm,稍小於均質化薄帶在與9 kOe的磁場方向呈70度夾角時的415ppm。 均質化的FePd30-xAux在9 kOe的場下對於X = 1, 5 和 7 時則表現出1240 ppm @ 90°, 1330 ppm @ 80° and 760 ppm @ 90°的值,其中FePd23Au7在測量時為母相。
由於均質化處理後的FePd29.5In0.5試片呈現完全bct相,因此並不具有任何形狀記憶的效果,而初製成的薄帶則在經過五十次熱循環後還保有35%的雙向形狀回復率。。添加金的試片中,無論是初製成或者是均質化後的試片都表現出雙向形狀記憶效應,在經過五十次熱循環後前者最高有58% (FePd23Au7)的雙向形狀回復率而後者最高只達到10%。
In this study the effect of cold rolling and homogenization on the transformation temperature, magnetization, magnetostriction and shape memory effect for melt-spun FePd29.5In0.5 and FePd30-xAux (x = 1, 5 and 7) alloys were investigated.
The homogenized FePd29.5In0.5 ribbon exhibited complete bct phase while only little bct was observed in the as-spin ribbon, on the other hand, no bct phase was observed in both as-spun and homogenized FePd30-xAux ribbons (x = 1, 5 and 7). The Ms of homogenized FePd30-xAux was found to decrease with Au content, while the Af of as-spun FePd30-xAux increased with Au content. At room temperature FePd23Au7 exhibited complete parent phase.
As-spun FePd29.5In0.5 ribbon exhibited higher room temperature saturated magnetization than that of homogenized sample, while the coercive field of the latter is lower. For as-spun and homogenized FePd30-xAux ribbon the room temperature saturated magnetization decreased with increased Au content. The magnetostriction of as-spun FePd29.5In0.5 reached maximum at 375 ppm under 9 kOe at 80° with respect to the field, and that of homogenized sample reached maximum at 415 ppm at 70° under 9 kOe. Homogenized FePd30-xAux exhibited higher magnetostriction under 9 KOe field, and the values are 1240 ppm at 90°, 1330 ppm at 80° and 760 ppm at 90° for X = 1, 5 and 7 respectively.
As-spun FePd29.5In0.5 exhibited Two-way shape memory effect with recovery ratio up to 35% after 50 thermal cycles, while the homogenized ribbon showed no shape memory effect due to the BCT phase. For homogenized FePd30-xAux the recovery ratio was only up to 10% after 50 thermal cycles while that of as-spun ribbon exhibited much higher recovery ratio up to 58% for X=7.
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