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Catégorie :Category: nCreator TI-Nspire
Auteur Author: oONOLTZOo
Type : Classeur 3.0.1
Page(s) : 1
Taille Size: 2.48 Ko KB
Mis en ligne Uploaded: 10/10/2024 - 08:08:25
Mis à jour Updated: 10/10/2024 - 08:08:52
Uploadeur Uploader: oONOLTZOo (Profil)
Téléchargements Downloads: 1
Visibilité Visibility: Archive publique
Shortlink : http://ti-pla.net/a4245209
Type : Classeur 3.0.1
Page(s) : 1
Taille Size: 2.48 Ko KB
Mis en ligne Uploaded: 10/10/2024 - 08:08:25
Mis à jour Updated: 10/10/2024 - 08:08:52
Uploadeur Uploader: oONOLTZOo (Profil)
Téléchargements Downloads: 1
Visibilité Visibility: Archive publique
Shortlink : http://ti-pla.net/a4245209
Description
Fichier Nspire généré sur TI-Planet.org.
Compatible OS 3.0 et ultérieurs.
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Copper-rich copperberyllium alloys are precipitation hardenable. After consulting the portion of the phase diagram given below in figure 1, do the following: (a) Specify the range of compositions over which these alloys may be precipitation hardened. Precipitation hardening (age hardening) is a process that involves the formation of fine precipitates within an alloy's microstructure to strengthen it. For copperberyllium alloys, precipitation hardening can occur over a certain range of compositions. Referring to a phase diagram, this range typically includes compositions with beryllium in the range of approximately 1.5 to 2.7 wt. % Be. Within this range, the alloy exhibits a two-phase region (± + ³) at lower temperatures, which is essential for precipitation hardening. Precipitation hardening occurs when the alloy is solution-treated and quenched to form a supersaturated solid solution, followed by aging at a lower temperature to form fine precipitates of the second phase. (b) Briefly describe the heat-treatment procedures (in terms of temperatures) that would be used to precipitation harden an alloy having a composition of your choosing, yet lying within the range given for part (a). For an alloy composition, let's assume 2 wt. % Be , which lies within the range suitable for precipitation hardening. Steps for heat treatment: Solution Treatment : Heat the alloy to a high temperature within the single-phase region of the phase diagram, typically around 800°C850°C . This temperature allows the alloy to form a homogeneous solid solution of copper and beryllium. Quenching : Rapidly cool (quench) the alloy in water to room temperature. This cooling creates a supersaturated solid solution where the beryllium atoms remain trapped in the copper matrix. Aging (Precipitation) : Reheat the alloy to a lower temperature, typically between 300°C350°C , and hold it for a specific period (several hours). During this process, fine precipitates of the Be-rich phase (³ phase) form within the copper matrix, strengthening the alloy. (c) Sketch the expected microstructure. Figure 1 2. Referring to Al-Si phase diagram shown in figure 2, explain why Al-Si with 10 wt. % of silicon cannot be heat-treated by precipitation hardening? (Hint: predict the microstructure of the alloy using the phase diagram, and explain your answer from there). The expected microstructure after precipitation hardening would show: A copper-rich matrix (± phase). Finely dispersed Be-rich precipitates (³ phase) within the copper matrix. The precipitates act as obstacles to dislocation motion, leading to increased strength. The size, distribution, and volume fraction of these precipitates depend on the aging temperature and time Made with nCreator - tiplanet.org
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Compatible OS 3.0 et ultérieurs.
<<
Copper-rich copperberyllium alloys are precipitation hardenable. After consulting the portion of the phase diagram given below in figure 1, do the following: (a) Specify the range of compositions over which these alloys may be precipitation hardened. Precipitation hardening (age hardening) is a process that involves the formation of fine precipitates within an alloy's microstructure to strengthen it. For copperberyllium alloys, precipitation hardening can occur over a certain range of compositions. Referring to a phase diagram, this range typically includes compositions with beryllium in the range of approximately 1.5 to 2.7 wt. % Be. Within this range, the alloy exhibits a two-phase region (± + ³) at lower temperatures, which is essential for precipitation hardening. Precipitation hardening occurs when the alloy is solution-treated and quenched to form a supersaturated solid solution, followed by aging at a lower temperature to form fine precipitates of the second phase. (b) Briefly describe the heat-treatment procedures (in terms of temperatures) that would be used to precipitation harden an alloy having a composition of your choosing, yet lying within the range given for part (a). For an alloy composition, let's assume 2 wt. % Be , which lies within the range suitable for precipitation hardening. Steps for heat treatment: Solution Treatment : Heat the alloy to a high temperature within the single-phase region of the phase diagram, typically around 800°C850°C . This temperature allows the alloy to form a homogeneous solid solution of copper and beryllium. Quenching : Rapidly cool (quench) the alloy in water to room temperature. This cooling creates a supersaturated solid solution where the beryllium atoms remain trapped in the copper matrix. Aging (Precipitation) : Reheat the alloy to a lower temperature, typically between 300°C350°C , and hold it for a specific period (several hours). During this process, fine precipitates of the Be-rich phase (³ phase) form within the copper matrix, strengthening the alloy. (c) Sketch the expected microstructure. Figure 1 2. Referring to Al-Si phase diagram shown in figure 2, explain why Al-Si with 10 wt. % of silicon cannot be heat-treated by precipitation hardening? (Hint: predict the microstructure of the alloy using the phase diagram, and explain your answer from there). The expected microstructure after precipitation hardening would show: A copper-rich matrix (± phase). Finely dispersed Be-rich precipitates (³ phase) within the copper matrix. The precipitates act as obstacles to dislocation motion, leading to increased strength. The size, distribution, and volume fraction of these precipitates depend on the aging temperature and time Made with nCreator - tiplanet.org
>>
