臺灣博碩士論文加值系統

本研究製備一系列雙添加元素高熵合金與全隨機/部份隨機添加高熵合金，藉由分析這些合金在鑄造態與均質化態的相組成，試圖了解高熵合金的成相行為。研究結果顯示，雙添加合金的相種類與元素間的鍵結強度，以及原子大小都有關係。均質化則對雙添加合金的相影響不大。有超過一半合金未發生相種類變化，這意味著鑄造態大致上保留了高溫的相。
隨機添加是指該合金的全部或部份元素，是由21種常用元素隨機選擇而來。這些合金由於其熔點或是元素化學性質差異甚大，造成熔煉的困難，而使得其鑄造結構相當不均勻。部份隨機添加合金的成相行為，仍可一定程度預測。全隨機添加合金的鑄造結構則相當不均勻，其成相也較無明確的趨勢，部份元素甚至以幾乎純元素的狀況獨自存在。需要更多這類合金來歸納其成相行為。

In this study, we produced dual alloying elements and all/part of arbitrary alloying elements high-entropy alloys (HEAs). Trying to understand that how the adding elements effected the phase behaviors by analyzing the microstructures and the composition-phase of these alloys. Beside as-cast alloys, we all the dual alloying elements alloys were treated in the condition of 1100⁰C 48 hours.
Arbitrary alloying means that all or part of the alloying elements were randomly selected from 21 elements. Because of the differences in melting points and the chemical properties of the different alloying elements, it is hard to do the arc-melting, leading to the asymmetrical of the microstructures in the arbitrary elements alloys.

摘要 i
Abstract ii
圖目次 v
表目次 ix
壹、前言 1
第一章參考文獻 3
貳、文獻回顧 4
2.1 高熵合金 4
2.2 高熵合金的成相法則 4
2.2.1 為什麼要研究成相法則？ 4
2.2.2 高熵合金現有的成相法則 5
2.3 Laves相 15
2.4 B82相 17
2.5 衍生結構(Derivative structure) 18
2.5.1 B81及B82 18
2.5.2 C23及C37 19
2.5.3 BCC相之衍生結構 19
2.6 CoCrFeNi添加單一元素的成相 23
第二章參考文獻 27
參、研究動機及實驗步驟 29
3.1 研究動機 29
3.2 實驗設計與流程 29
3.3 元素性質列表 30
3.4 合金製備 31
3.5 熱處理 31
3.6 相與微結構分析 31
第三章參考文獻 35
肆、結果與討論 36
4.1 鑄造態雙添加合金的相與微結構分析 36
4.2 1100°C48小時均質化退火的相與微結構分析 57
4.3 鑄造態與均質化態相與微結構比較 78
4.4 五元隨機添加合金鑄造態相與微結構分析 91
4.5 雙添加合金與隨機添加合金成相行為探討 111
4.5.1 鑄造態雙添加合金成相行為探討 111
4.5.2 1100⁰C 48小時均質化退火雙添加合金之成相行為115
4.5.3 鑄造態隨機添加合金成相行為探討 117
4.6 於口試後之新配方 125
第四章參考文獻 130
伍、結論 131
陸、未來工作 134

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