Examining The Phase Formation of Aging and Shallow Cryogenic Process Applied to Aluminum Alloys with Thermal Analysis

Gözde Altuntaş; Bulent Bostan

Makale detayları

Examining The Phase Formation of Aging and Shallow Cryogenic Process Applied to Aluminum Alloys with Thermal Analysis

Yazarlar:

Gözde Altuntaş | Bulent Bostan

Yayıncı:

Gazi University

Ana Başlıklar:

Fiziksel Metalurji

Dergi:

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji Vol.12 Issue 1, pp.324-331

Belge Tipi:

Makale

Yayın Tarihi:

3/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001313845

pISSN:

2147-9526

Anahtar kelimeler:

Özet:

 In this study, cryogenic treatment was applied to the 7 series alloy, which is one of the aluminum alloys frequently used in the aviation and space industry, after the retrogression and re-aging process, and the phase formations were examined by thermal analysis. First of all, solution heat treatment was applied at 480 C for 2 hours and water was given. After quenching, artificial aging heat treatment was applied at 120 C for 24 hours. To start the RRA retrogression and re-aging heat treatment, after artificial aging, retrogression was performed at 200 C for 10 minutes and quenched. Then, re-aging was performed at 120 C for 24 hours and the aging process was completed. After the RRA heat treatment, cryogenic treatment was applied for 2 hours at -40 C, -80 C respectively. The heat treated samples were analyzed with a differential thermal analyzer and the transformations of GP, η and η phases were found. Since the η phase is known as the strength-increasing phase in the structure, the activation energies of each sample were calculated using the Augis-Bennet and Kissinger equations. The results showed that the activation energy of the sample treated with -40 cryogenic treatment was 50 less than the sample without cryogenic treatment. This situation proved with the Arrhenius equation that the formation of the η phase would be easier.

 In this study, cryogenic treatment was applied to the 7 series alloy, which is one of the aluminum alloys frequently used in the aviation and space industry, after the retrogression and re-aging process, and the phase formations were examined by thermal analysis. First of all, solution heat treatment was applied at 480 C for 2 hours and water was given. After quenching, artificial aging heat treatment was applied at 120 C for 24 hours. To start the RRA retrogression and re-aging heat treatment, after artificial aging, retrogression was performed at 200 C for 10 minutes and quenched. Then, re-aging was performed at 120 C for 24 hours and the aging process was completed. After the RRA heat treatment, cryogenic treatment was applied for 2 hours at -40 C, -80 C respectively. The heat treated samples were analyzed with a differential thermal analyzer and the transformations of GP, η and η phases were found. Since the η phase is known as the strength-increasing phase in the structure, the activation energies of each sample were calculated using the Augis-Bennet and Kissinger equations. The results showed that the activation energy of the sample treated with -40 cryogenic treatment was 50 less than the sample without cryogenic treatment. This situation proved with the Arrhenius equation that the formation of the η phase would be easier.

 In this study, cryogenic treatment was applied to the 7 series alloy, which is one of the aluminum alloys frequently used in the aviation and space industry, after the retrogression and re-aging process, and the phase formations were examined by thermal analysis. First of all, solution heat treatment was applied at 480 C for 2 hours and water was given. After quenching, artificial aging heat treatment was applied at 120 C for 24 hours. To start the RRA retrogression and re-aging heat treatment, after artificial aging, retrogression was performed at 200 C for 10 minutes and quenched. Then, re-aging was performed at 120 C for 24 hours and the aging process was completed. After the RRA heat treatment, cryogenic treatment was applied for 2 hours at -40 C, -80 C respectively. The heat treated samples were analyzed with a differential thermal analyzer and the transformations of GP, η and η phases were found. Since the η phase is known as the strength-increasing phase in the structure, the activation energies of each sample were calculated using the Augis-Bennet and Kissinger equations. The results showed that the activation energy of the sample treated with -40 cryogenic treatment was 50 less than the sample without cryogenic treatment. This situation proved with the Arrhenius equation that the formation of the η phase would be easier.

 In this study, cryogenic treatment was applied to the 7 series alloy, which is one of the aluminum alloys frequently used in the aviation and space industry, after the retrogression and re-aging process, and the phase formations were examined by thermal analysis. First of all, solution heat treatment was applied at 480 C for 2 hours and water was given. After quenching, artificial aging heat treatment was applied at 120 C for 24 hours. To start the RRA retrogression and re-aging heat treatment, after artificial aging, retrogression was performed at 200 C for 10 minutes and quenched. Then, re-aging was performed at 120 C for 24 hours and the aging process was completed. After the RRA heat treatment, cryogenic treatment was applied for 2 hours at -40 C, -80 C respectively. The heat treated samples were analyzed with a differential thermal analyzer and the transformations of GP, η and η phases were found. Since the η phase is known as the strength-increasing phase in the structure, the activation energies of each sample were calculated using the Augis-Bennet and Kissinger equations. The results showed that the activation energy of the sample treated with -40 cryogenic treatment was 50 less than the sample without cryogenic treatment. This situation proved with the Arrhenius equation that the formation of the η phase would be easier.

Makale detayları

Examining The Phase Formation of Aging and Shallow Cryogenic Process Applied to Aluminum Alloys with Thermal Analysis

Yazarlar:

Gözde Altuntaş | Bulent Bostan

Yayıncı:

Gazi University

Ana Başlıklar:

Fiziksel Metalurji

Dergi:

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji Vol.12 Issue 1, pp.324-331

Belge Tipi:

Makale

Yayın Tarihi:

3/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001313845

pISSN:

2147-9526

7075 Al alloy

thermal analysis

cryogenic treatment

retrogression and re-aging

Sayı

Makale detayları

Examining The Phase Formation of Aging and Shallow Cryogenic Process Applied to Aluminum Alloys with Thermal Analysis

Yazarlar: Gözde Altuntaş | Bulent Bostan

Yayıncı: Gazi University

Ana Başlıklar: Fiziksel Metalurji

Dergi: Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji Vol.12 Issue 1, pp.324-331

Belge Tipi: Makale

Yayın Tarihi: 3/2024

Belge Dili: İngilizce

Document ID (Org No.): 2001313845

pISSN: 2147-9526

7075 Al alloy

thermal analysis

cryogenic treatment

retrogression and re-aging

Sayı

Yazarlar:

Gözde Altuntaş | Bulent Bostan

Yayıncı:

Gazi University

Ana Başlıklar:

Fiziksel Metalurji

Dergi:

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji Vol.12 Issue 1, pp.324-331

Belge Tipi:

Makale

Yayın Tarihi:

3/2024

Belge Dili:

İngilizce

Document ID (Org No.):

2001313845

pISSN:

2147-9526