Quality Index (Q_T) Calculator

The Quality Index (Q_T) is a method developed by Murat Tiryakioğlu and collaborators to relate tensile properties to the achievable performance of a given alloy. Rather than assessing strength or elongation in isolation, Q_T provides a normalized measure of how efficiently a casting process converts alloy capability into real performance.

In practical terms, QT often reveals that many castings considered “acceptable” are performing well below the mechanical capability already being achieved elsewhere in the industry. QT highlights the difference between meeting specification and achieving true process capability.

This calculator is based on the published Q_T framework and is intended as a practical tool to assess casting process performance.

Most castings operate well below their achievable potential. This tool shows you where you actually are.

QT Calculator Desktop Version

The desktop version of the Aluminum Quality Index Calculator expands beyond the web-based tool with local data storage, trend analysis, filtering and export capabilities designed for real production environments.

Further Reading (Q_T Methodology)
This calculator is based on the published work of Murat Tiryakioğlu and collaborators. The papers below outline the development of the Quality Index (Q_T) and its application to casting quality assessment and form the basis of the approach used here.

Quality Indices for Aluminum Alloy Castings: A Critical Review, 2009 – Tiryakioğlu et al.
On the Ductility of Cast Al7 Pct Si-Mg Alloys, 2009 – Tiryakioğlu et al.
Quality Index for Aluminum Alloy Castings, 2015 – Tiryakioğlu et al.
Ductility Potential and Quality Index for Aluminum Alloy Castings: An Update, 2026 – Tiryakioğlu et al.