tutorial 1A,
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Catégorie :Category: nCreator TI-Nspire
Auteur Author: oONOLTZOo
Type : Classeur 3.0.1
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Mis en ligne Uploaded: 10/10/2024 - 08:14:32
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Shortlink : http://ti-pla.net/a4245214
Type : Classeur 3.0.1
Page(s) : 1
Taille Size: 2.59 Ko KB
Mis en ligne Uploaded: 10/10/2024 - 08:14:32
Uploadeur Uploader: oONOLTZOo (Profil)
Téléchargements Downloads: 1
Visibilité Visibility: Archive publique
Shortlink : http://ti-pla.net/a4245214
Description
Fichier Nspire généré sur TI-Planet.org.
Compatible OS 3.0 et ultérieurs.
<<
Copper-rich copperberyllium alloys are precipitationhardenable. After consulting the portion of the phase diagram given below infigure 1, do the following: (a) Specify therange of compositions over which these alloys may be precipitation hardened. Precipitation hardening (age hardening) is a process thatinvolves the formation of fine precipitates within an alloy's microstructure tostrengthen it. For copperberyllium alloys, precipitation hardening can occurover a certain range of compositions. Referring to a phase diagram, this rangetypically includes compositions with beryllium in the range of approximately 1.5to 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 quenchedto form a supersaturated solid solution, followed by aging at a lowertemperature to form fine precipitates of the second phase. (b) Briefly describe the heat-treatment procedures (interms of temperatures) that would be used to precipitation harden an alloyhaving a composition of your choosing, yet lying within the range given forpart (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 10wt. % of silicon cannot be heat-treated by precipitation hardening? (Hint:predict the microstructure of the alloy using the phase diagram, and explainyour answer from there). The expected microstructure after precipitation hardeningwould 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 ofthese precipitates depend on the aging temperature and time Made with nCreator - tiplanet.org
>>
Compatible OS 3.0 et ultérieurs.
<<
Copper-rich copperberyllium alloys are precipitationhardenable. After consulting the portion of the phase diagram given below infigure 1, do the following: (a) Specify therange of compositions over which these alloys may be precipitation hardened. Precipitation hardening (age hardening) is a process thatinvolves the formation of fine precipitates within an alloy's microstructure tostrengthen it. For copperberyllium alloys, precipitation hardening can occurover a certain range of compositions. Referring to a phase diagram, this rangetypically includes compositions with beryllium in the range of approximately 1.5to 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 quenchedto form a supersaturated solid solution, followed by aging at a lowertemperature to form fine precipitates of the second phase. (b) Briefly describe the heat-treatment procedures (interms of temperatures) that would be used to precipitation harden an alloyhaving a composition of your choosing, yet lying within the range given forpart (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 10wt. % of silicon cannot be heat-treated by precipitation hardening? (Hint:predict the microstructure of the alloy using the phase diagram, and explainyour answer from there). The expected microstructure after precipitation hardeningwould 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 ofthese precipitates depend on the aging temperature and time Made with nCreator - tiplanet.org
>>
