| 000 -LEADER |
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| fixed length control field |
03141nam a22001577a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER |
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| Classification number |
621 |
| 100 ## - MAIN ENTRY--PERSONAL NAME |
|---|
| Personal name |
Saif ur Rahman, |
| 245 ## - TITLE STATEMENT |
|---|
| Title |
Development, Characterization and Testing of Nickel Titanium Based High Temperature Shape Memory Alloys / |
| Statement of responsibility, etc. |
Saif ur Rahman |
| 264 ## - PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE |
|---|
| Place of production, publication, distribution, manufacture |
Islamabad : |
| Name of producer, publisher, distributor, manufacturer |
SMME- NUST; |
| Date of production, publication, distribution, manufacture, or copyright notice |
2016. |
| 300 ## - PHYSICAL DESCRIPTION |
|---|
| Extent |
216p. |
| Other physical details |
Islamabad : SMME- NUST; Soft Copy |
| Dimensions |
30cm |
| 500 ## - GENERAL NOTE |
|---|
| General note |
TiNi-based shape memory alloys are well known for their excellent shape memory<br/>and superelastic properties. TiNiPd alloys are considered as the better high<br/>temperature shape memory alloys due to high transformation temperatures, small<br/>hysteresis, reasonable strain recovery and comparable workability. However, by<br/>further increasing the transformation temperatures i.e. by increasing the Pd content,<br/>thermal hysteresis also increases. This has an adverse effect on the actuation<br/>behavior of the alloy. At high temperature the critical stress for slip deformation of<br/>TiNiPd alloys also decreases, which increases the permanent deformation and<br/>reduces the strain recovery in the alloy. In order to prevent increase in thermal<br/>hysteresis, reduce permanent deformation and increase strain recovery in TiNiPd<br/>alloy, Ni has been replaced by 5 at%, 10 at% and 15 at% Cu. Four alloys;<br/>Ti50Ni25Pd25, Ti50Ni20Pd25Cu5, Ti50Ni15Pd25Cu10 and Ti50Ni10Pd25Cu15 (all in atomic<br/>%) have been developed and characterized for their microstructure, phase<br/>transformation temperatures, mechanical and shape memory properties in solution<br/>treated condition. By increasing the Cu content, the transformation temperature of<br/>the TiNiPdCu alloys significantly increased, whereas thermal hysteresis decreased.<br/>Similarly, the microhardness, yield and fracture strength also increased. Shape<br/>memory properties like strain recovery and work output also improved. Therefore,<br/>TiNiPdCu alloys showed improved transformation temperatures, strain recovery and<br/>critical stress for slip deformation through solid solution strengthening mechanism.<br/>The TiNiPdCu alloys were also aged at different aging temperatures i.e. 400°C,<br/>500°C, 600°C and 700°C for 3 hours to investigate their transformation<br/>temperatures, mechanical and shape memory properties and compared with the<br/>solution treated samples. By aging the Ti50Ni25Pd25 and Ti50Ni20Pd25Cu5 alloys, the<br/>transformation temperatures, mechanical and shape memory properties slightly<br/>increased. After aging the Ti50Ni15Pd25Cu10 and Ti50Ni10Pd25Cu15 alloys, the<br/>transformation temperatures and shape memory properties significantly decreased,<br/>however the mechanical properties were improved.<br/>viii<br/>It can be concluded that aging of Ti50Ni25Pd25 and Ti50Ni20Pd25Cu5 alloys is<br/>beneficial to increase their transformation temperatures and shape memory<br/>properties. However it has an adverse effect in terms of transformation temperatures<br/>and strain recovery by aging the Ti50Ni15Pd25Cu10 and Ti50Ni10Pd25Cu15 alloys. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
PhD in Mechanical Engineering |
| 700 ## - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Supervisor : Dr. Mushtaq Khan |
| 856 ## - ELECTRONIC LOCATION AND ACCESS |
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| Uniform Resource Identifier |
<a href="http://10.250.8.41:8080/xmlui/handle/123456789/3734">http://10.250.8.41:8080/xmlui/handle/123456789/3734</a> |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Source of classification or shelving scheme |
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| Koha item type |
Thesis |
