臺灣博碩士論文加值系統

本文主要利用光學顯微鏡與電子顯微鏡分析技術，針對Ti-5Al-2.5Mo-1.4V合金板材不同熱處理之顯微組織，進行研究分析。主要研究結果顯示如下：
1.本文中合金的相轉變溫度約為910℃，在900℃以下固溶，金相為α相及島狀物β相，β晶粒隨固溶溫度增加而增長，於900℃固溶時，β相面積分率最高可達65%，經920℃以上的固溶，透過電子顯微鏡可觀察到其顯微組織中為β和針狀α/相，硬度為Hv300~Hv370。
2.920℃~960℃固溶經時效，麻田散析出物隨時間及溫度增加而分解，但產生黑色層狀物，在層狀物間經時效而有ω相析出物析出，並且黑色層狀物隨著時間有增加的現象，硬度值最高可達Hv472，但具脆性。
3.本研究之Ti-5Al-2.5Mo-1.4V合金試片，經過820℃~900℃固溶經時效，利用TEM可觀察到島狀區域有ω相析出，經實驗與文獻資料比較，固溶880℃1小時經時效550℃4小時，硬度則可高達Hv395，為最佳的熱處理條件。

The main purposes of the present study is to investigate the phase transformations of Ti-5Al-2.4Mo-1.4V alloy by means of optical microscope(OM) and transmission electron microscope(TEM). In the study some main results are described as followings:
1. In the study phase transform point of Ti-5Al-2.4Mo-1.4V alloy is about 910℃ solution heat treatments below 900℃ quenching in water, the optical microscope(OM) are indicated that globular particle of β in the α matrix ,and the β grains size grow with longer time and higher temperature. In SHT 940℃ the β area rate can reach 65％. Upon 940℃ SHT the OM can be found β and needle α/ phases, and hardness of the specimens is Hv300~Hv370.
2. The OM of specimens in 920℃~960℃ SHT and aging has been observed martensite microstructure α/ divided, and ω phase has been found precipitated by TEM . And the max hardness can be reached Hv472, but brittle.
3. In the study the specimens processed low temperature solution heat treatment and aging heat treatment (STA), the OM found globular particle of β in the matrix become black. The highest hardness of the specimens with SHT 880℃ for 1 hour and aging 550℃ for 4 hours is the best experiment condition which can reach Hv395.
Keyword：SHT, transmission electron microscope(TEM), optical microscope(OM).

摘要 I
Abstract II
誌謝.III
目錄.............................................................................................................IV
表目錄 ............................................................................................................VI
圖目錄. VII
第一章 前言 1
第二章 文獻回顧 3
2.1 鈦合金特性 3
2.2 添加合金元素對鈦合金的影響 5
2.3 鈦合金的分類 6
2.4 鈦合金顯微組織的分類 7
2.5其他文獻 10
第三章 研究方法及步驟 14
3.1 材料製備與實驗步驟 14
3.2 材料熱處理 14
3.3 顯微組織觀察 15
3.3.1 光學顯微鏡觀察（OM） 15
3.3.2 穿透式電子顯微鏡觀察（TEM） 15
3.4硬度試驗 16
第四章 結果與討論 19
4.1. 固溶熱處理之顯微組織 19
4.2. 時效熱處理之顯微組織 20
4.3. 硬度試驗 20
第五章 結 論.............................................................................................55
參考文獻 56

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