## Gamma Prime(範圍總理)到底是什麼？

Gamma Prime 範圍總理 - Based on the dispersed barrier hardening model, individual obstacle strengthening factors of the microstructural features, including gamma prime, helium bubbles, Frank loops, and small defect clusters are computed.^{[1]}This single crystal superalloy's microstructure consists of three phases: Gamma, Gamma prime, and a bit of carbide.

^{[2]}Haynes 282 is a Ni-based gamma prime (γ′) strengthening alloy with a balanced combination of high temperature properties and fabricability.

^{[3]}The crystal structure of nickel: It is distributed in two phases, gamma (γ) and gamma prime (γ›): -Gamma phase: solid solution centered on the faces that acts as a matrix.

^{[4]}At 780°C, above the solvus temperature of gamma prime (γ’), but below that of the chromium-rich M23C6 carbides, the microstructure could be regarded as constant.

^{[5]}While previous work has shown that large concentrations of Cu in fcc HEAs based on CoCrFeNi can lead to embrittlement, the present study clearly shows that in small amounts this alloying element can be quite beneficial, since Cu stabilizes the ordered L12 (gamma prime) phase, and acts as a heterogeneous nucleation site for this ordered phase within the fcc matrix.

^{[6]}Gamma prime (gamma') precipitates are present in all the material conditions with particle sizes ranging from 2.

^{[7]}

基於分散勢壘強化模型，計算了伽馬素數、氦氣泡、弗蘭克環和小缺陷簇等微觀結構特徵的單個障礙強化因子。

^{[1]}這種單晶高溫合金的微觀結構由三相組成：伽瑪、伽瑪素和少量碳化物。

^{[2]}Haynes 282 是一種鎳基伽馬 (γ') 強化合金，具有高溫性能和可加工性的平衡組合。

^{[3]}鎳的晶體結構：它分佈在兩個相中，γ (γ) 和γ′ (γ›)： -γ 相：以表面為中心的固溶體，充當基質。

^{[4]}在 780°C 時，高於 γ′ (γ’) 的固溶線溫度，但低於富鉻 M23C6 碳化物的固溶線溫度，微觀結構可被視為恆定。

^{[5]}雖然之前的工作表明，基於 CoCrFeNi 的 fcc HEAs 中的高濃度 Cu 會導致脆化，但目前的研究清楚地表明，少量這種合金元素可能是非常有益的，因為 Cu 可以穩定有序的 L12（γ′）相，並作為 fcc 矩陣內該有序相的異質成核位點。

^{[6]}伽馬素 (gamma') 沉澱物存在於所有材料條件下，粒徑範圍為 2。

^{[7]}

## gamma double prime 伽馬雙素數

Quantitative microstructural analysis was carried out to determine the size and volume fraction of strengthening phases: gamma double prime (γ″) and gamma prime (γ′); in additively manufactured (AM) Inconel 718 (IN718) with an emphasis on the utilization of Nb for γ″ formation during aging treatment.^{[1]}HT microstructure resulted in the formation of homogeneous austenite gamma (γ) matrix in which the strengthening phases such as gamma prime (γ′) (Ni3 (Al, Ti)) and gamma double prime (γ″) (Ni3Nb) were observed.

^{[2]}

進行定量顯微組織分析以確定強化相的尺寸和體積分數：伽馬雙素（γ”）和伽馬（γ'）；在增材製造 (AM) Inconel 718 (IN718) 中，重點是在時效處理期間利用 Nb 形成 γ”。

^{[1]}HT顯微組織形成均質奧氏體γ(γ)基體，其中觀察到γ′(γ′)(Ni3(Al,Ti))和γ雙′(γ″)(Ni3Nb)等強化相。

^{[2]}

## gamma prime particle 伽瑪素粒子

4 ks in order to determine the characteristic of re-precipitated gamma prime particles.^{[1]}It seems that the selected solutioning temperatures and/or times were not sufficient to completely dissolve all coarse gamma prime particles after long term heating for all samples with alloying additions.

^{[2]}From all obtained results, it was found that the effect of temperature dropping provided the different in received reheat treated microstructures when considering in term of precipitation gamma prime particle morphology such as shape, size and phase density.

^{[3]}From the results, it can be seen that the higher temperature of the solution treatment with respect to the pre-weld heat treatment provided coarser gamma prime particles precipitating in a gamma matrix with a more uniform microstructure and very fine gamma prime precipitated particles.

^{[4]}

4 ks 以確定再沉澱的伽馬素粒子的特性。

^{[1]}對於所有添加合金的樣品，在長期加熱後，選擇的溶解溫度和/或時間似乎不足以完全溶解所有粗γ′粒子。

^{[2]}從所有獲得的結果中發現，在考慮沉澱γ′粒子形態如形狀、尺寸和相密度時，溫度下降的影響提供了不同的再熱處理微觀結構。

^{[3]}從結果可以看出，與焊前熱處理相比，固溶處理的更高溫度提供了在具有更均勻微觀結構的伽馬基體中沉澱的更粗的伽馬′粒子和非常細的伽馬′沉澱粒子。

^{[4]}

## gamma prime precipitate

The microstructural analyses showed the presence of fine gamma prime precipitates in the as-deposited samples, while after aging, the alloy possessed around 40 vol.^{[1]}It is strengthened by the presence of gamma prime precipitates in its microstructure, which enhance its strength at high temperatures.

^{[2]}The decrease in yield stress under air was attributed to an oxide scale induced surface softening effect and the loss of strengthening efficiency for the gamma prime precipitates.

^{[3]}

微觀結構分析表明，在沉積的樣品中存在細小的 γ′ 沉澱物，而在時效後，合金的體積約為 40 vol。

^{[1]}它通過在其微觀結構中存在伽馬′沉澱物而得到強化，這增強了其在高溫下的強度。

^{[2]}空氣下屈服應力的降低歸因於氧化皮引起的表面軟化效應和γ′沉澱物強化效率的損失。

^{[3]}

## gamma prime phase

In situ corrosion studies on precipitate-hardened nickel superalloys in sCO2 have shown potentially dangerous subsurface depletion of gamma prime phase.^{[1]}The effect of rhenium and cobalt additions on the microstructure and gamma prime phase stability of modified nickel-based superalloy, grade MGA1400 by means of a vacuum arc melting method with different contents of rhenium (Re) and cobalt (Co) was investigated.

^{[2]}The microstructural analysis shows increasing of the medium distance of secondary dendrite arms D, what is related to chemical changes in dendritic structure, and the intermetallic strengthening gamma prime phase coarse and turn into spherical shape what leads to decreasing of dislocation and precipitation strengthening mechanism and further decreasing of hot temperature properties of the alloy.

^{[3]}

對 sCO2 中沉澱硬化鎳超合金的原位腐蝕研究表明，γ′相存在潛在危險的亞表面耗盡。

^{[1]}採用真空電弧熔煉法研究了不同錸 (Re) 和鈷 (Co) 含量的摻錸和鈷對改性鎳基高溫合金牌號 MGA1400 的顯微組織和γ′相穩定性的影響。

^{[2]}顯微組織分析表明，二次枝晶臂中距D的增加，與枝晶結構的化學變化有關，金屬間強化γ相粗化並轉為球形，導致位錯和析出強化機制減少，進一步合金的高溫性能下降。

^{[3]}

## gamma prime precipitation 伽馬素沉澱

The severe plastic deformation and simultaneous high temperature with rapid cooling resulted in dramatic changes of the liquation-cracking-related microstructures: high volume fraction gamma prime precipitations were completely dissolved into the matrix, carbide dendrites were fully disintegrated and matrix grain size was remarkably refined to submicron scale.^{[1]}This study reports the crack-free fabrication of a new high gamma prime precipitation hardened Ni-based superalloy by Laser Powder Bed Fusion (LPBF) process.

^{[2]}The influence of strain rate and the role of gamma prime precipitation on the progress of recrystallization were analyzed and quantified.

^{[3]}

劇烈的塑性變形和快速冷卻同時發生的高溫導致與液化開裂相關的顯微組織發生巨大變化：高體積分數的γ′析出物完全溶解在基體中，碳化物枝晶完全解體，基體晶粒尺寸顯著細化至亞微米尺度。

^{[1]}本研究報告了通過激光粉末床融合 (LPBF) 工藝無裂紋製造一種新型高伽馬沉澱硬化鎳基高溫合金。

^{[2]}對應變速率的影響和γ′析出對再結晶進程的作用進行了分析和量化。

^{[3]}

## gamma prime coarsening

The 1% Titanium content can affect the gamma prime coarsening and make the grain on the microstructure result smooth.^{[1]}Finally, a model to describe secondary and ternary gamma prime coarsening upon aging treatments is presented.

^{[2]}

1%的鈦含量會影響γ′粗化並使微觀結構上的晶粒光滑。

^{[1]}最後，提出了一個模型來描述老化處理後的二次和三元γ′粗化。

^{[2]}