The Experts below are selected from a list of 28434 Experts worldwide ranked by ideXlab platform

Bhagwati Prasad Kashyap - One of the best experts on this subject based on the ideXlab platform.

  • correlation between microstructural features and Creep Strain in a near α titanium alloy processed in the α β regime
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014
    Co-Authors: I. Balasundar, T. Raghu, Bhagwati Prasad Kashyap
    Abstract:

    Abstract High temperature Creep is an important property of titanium alloys used in aeroengines. Creep resistance of titanium alloys generally varies with heat treatment, temperature and cooling rate. Both the parameters affect the morphology and topology of the α (HCP) and β (BCC) phase present in the material. Various theories have been proposed in the literature to explain (i) the increase in Creep Strain with decreasing solution treatment temperature and (ii) the U-shaped variation of Creep Strain with cooling rate. Some of these theories are quite contradictory. An attempt is made here to systematically (a) evaluate and establish a direct microstructure–mechanical property correlation and (b) to explain the observed variation in the Creep behaviour of a near-α titanium alloy IMI 834. The results obtained indicate that the observed U-shaped variation of Creep curve is due to the counter acting nature of various microstructural features present in the material.

  • Correlation between microstructural features and Creep Strain in a near-α titanium alloy processed in the α+β regime
    Materials Science and Engineering: A, 2014
    Co-Authors: I. Balasundar, T. Raghu, Bhagwati Prasad Kashyap
    Abstract:

    Abstract High temperature Creep is an important property of titanium alloys used in aeroengines. Creep resistance of titanium alloys generally varies with heat treatment, temperature and cooling rate. Both the parameters affect the morphology and topology of the α (HCP) and β (BCC) phase present in the material. Various theories have been proposed in the literature to explain (i) the increase in Creep Strain with decreasing solution treatment temperature and (ii) the U-shaped variation of Creep Strain with cooling rate. Some of these theories are quite contradictory. An attempt is made here to systematically (a) evaluate and establish a direct microstructure–mechanical property correlation and (b) to explain the observed variation in the Creep behaviour of a near-α titanium alloy IMI 834. The results obtained indicate that the observed U-shaped variation of Creep curve is due to the counter acting nature of various microstructural features present in the material.

J P Lucas - One of the best experts on this subject based on the ideXlab platform.

  • quantification of Creep Strain distribution in small crept lead free in situ composite and non composite solder joints
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000
    Co-Authors: J Mcdougall, S Choi, T R Bieler, K N Subramanian, J P Lucas
    Abstract:

    Abstract Single shear lap Creep specimens with a 1 mm 2 cross sectional area (similar in size to solder joints used in electronic packaging) were developed using lead free solders to examine the effect of in situ composite microstructures on the Creep resistance and damage accumulation processes at temperatures between 25 and 150°C. Local Strain measurements were made optically by following the change in shape of a scratch. Average Creep Strain measurements on non-composite solder joints were similar to comparable data from solder joint specimens in the literature. The distribution of Strain across the specimen was measured in detail to determine how Strain instabilities develop near interfaces, or near the center of the solder joint. The evolution of Strain is quantified across the joint and related to microstructural features such as voids and reinforcements. Room temperature Creep resistance is far superior in the composite, but at elevated temperatures, both types of joints have similar Creep resistance. By analysis of the local Strain history, a criteria for damage initiation is identified in terms of the local Strain where the onset of tertiary Creep is first observed, and subsequently accelerates heterogeneous Straining in the joint. The in situ composite solders cause a more homogeneous Strain evolution compared to the non-composite solder, but local tertiary Creep commences at a lower Strain than in the non-composite joint, but only, at lower temperatures and higher Strain-rates. The impact of these different constitutive behavior and damage accumulation conditions is discussed as it pertains to improving the long term reliability of a solder joint.

I. Balasundar - One of the best experts on this subject based on the ideXlab platform.

  • correlation between microstructural features and Creep Strain in a near α titanium alloy processed in the α β regime
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014
    Co-Authors: I. Balasundar, T. Raghu, Bhagwati Prasad Kashyap
    Abstract:

    Abstract High temperature Creep is an important property of titanium alloys used in aeroengines. Creep resistance of titanium alloys generally varies with heat treatment, temperature and cooling rate. Both the parameters affect the morphology and topology of the α (HCP) and β (BCC) phase present in the material. Various theories have been proposed in the literature to explain (i) the increase in Creep Strain with decreasing solution treatment temperature and (ii) the U-shaped variation of Creep Strain with cooling rate. Some of these theories are quite contradictory. An attempt is made here to systematically (a) evaluate and establish a direct microstructure–mechanical property correlation and (b) to explain the observed variation in the Creep behaviour of a near-α titanium alloy IMI 834. The results obtained indicate that the observed U-shaped variation of Creep curve is due to the counter acting nature of various microstructural features present in the material.

  • Correlation between microstructural features and Creep Strain in a near-α titanium alloy processed in the α+β regime
    Materials Science and Engineering: A, 2014
    Co-Authors: I. Balasundar, T. Raghu, Bhagwati Prasad Kashyap
    Abstract:

    Abstract High temperature Creep is an important property of titanium alloys used in aeroengines. Creep resistance of titanium alloys generally varies with heat treatment, temperature and cooling rate. Both the parameters affect the morphology and topology of the α (HCP) and β (BCC) phase present in the material. Various theories have been proposed in the literature to explain (i) the increase in Creep Strain with decreasing solution treatment temperature and (ii) the U-shaped variation of Creep Strain with cooling rate. Some of these theories are quite contradictory. An attempt is made here to systematically (a) evaluate and establish a direct microstructure–mechanical property correlation and (b) to explain the observed variation in the Creep behaviour of a near-α titanium alloy IMI 834. The results obtained indicate that the observed U-shaped variation of Creep curve is due to the counter acting nature of various microstructural features present in the material.

J Mcdougall - One of the best experts on this subject based on the ideXlab platform.

  • quantification of Creep Strain distribution in small crept lead free in situ composite and non composite solder joints
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2000
    Co-Authors: J Mcdougall, S Choi, T R Bieler, K N Subramanian, J P Lucas
    Abstract:

    Abstract Single shear lap Creep specimens with a 1 mm 2 cross sectional area (similar in size to solder joints used in electronic packaging) were developed using lead free solders to examine the effect of in situ composite microstructures on the Creep resistance and damage accumulation processes at temperatures between 25 and 150°C. Local Strain measurements were made optically by following the change in shape of a scratch. Average Creep Strain measurements on non-composite solder joints were similar to comparable data from solder joint specimens in the literature. The distribution of Strain across the specimen was measured in detail to determine how Strain instabilities develop near interfaces, or near the center of the solder joint. The evolution of Strain is quantified across the joint and related to microstructural features such as voids and reinforcements. Room temperature Creep resistance is far superior in the composite, but at elevated temperatures, both types of joints have similar Creep resistance. By analysis of the local Strain history, a criteria for damage initiation is identified in terms of the local Strain where the onset of tertiary Creep is first observed, and subsequently accelerates heterogeneous Straining in the joint. The in situ composite solders cause a more homogeneous Strain evolution compared to the non-composite solder, but local tertiary Creep commences at a lower Strain than in the non-composite joint, but only, at lower temperatures and higher Strain-rates. The impact of these different constitutive behavior and damage accumulation conditions is discussed as it pertains to improving the long term reliability of a solder joint.

T. Raghu - One of the best experts on this subject based on the ideXlab platform.

  • correlation between microstructural features and Creep Strain in a near α titanium alloy processed in the α β regime
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014
    Co-Authors: I. Balasundar, T. Raghu, Bhagwati Prasad Kashyap
    Abstract:

    Abstract High temperature Creep is an important property of titanium alloys used in aeroengines. Creep resistance of titanium alloys generally varies with heat treatment, temperature and cooling rate. Both the parameters affect the morphology and topology of the α (HCP) and β (BCC) phase present in the material. Various theories have been proposed in the literature to explain (i) the increase in Creep Strain with decreasing solution treatment temperature and (ii) the U-shaped variation of Creep Strain with cooling rate. Some of these theories are quite contradictory. An attempt is made here to systematically (a) evaluate and establish a direct microstructure–mechanical property correlation and (b) to explain the observed variation in the Creep behaviour of a near-α titanium alloy IMI 834. The results obtained indicate that the observed U-shaped variation of Creep curve is due to the counter acting nature of various microstructural features present in the material.

  • Correlation between microstructural features and Creep Strain in a near-α titanium alloy processed in the α+β regime
    Materials Science and Engineering: A, 2014
    Co-Authors: I. Balasundar, T. Raghu, Bhagwati Prasad Kashyap
    Abstract:

    Abstract High temperature Creep is an important property of titanium alloys used in aeroengines. Creep resistance of titanium alloys generally varies with heat treatment, temperature and cooling rate. Both the parameters affect the morphology and topology of the α (HCP) and β (BCC) phase present in the material. Various theories have been proposed in the literature to explain (i) the increase in Creep Strain with decreasing solution treatment temperature and (ii) the U-shaped variation of Creep Strain with cooling rate. Some of these theories are quite contradictory. An attempt is made here to systematically (a) evaluate and establish a direct microstructure–mechanical property correlation and (b) to explain the observed variation in the Creep behaviour of a near-α titanium alloy IMI 834. The results obtained indicate that the observed U-shaped variation of Creep curve is due to the counter acting nature of various microstructural features present in the material.