Crystallographic characterisation of crystalline defects in Ti-based metallic glass: influence of stress and temperature

The BMG Ti40Cu36Zr10Pd14 grade has already been demonstrated as a material with very high potential for biomedical applications [1], [2] (mainly the manufacturing of dental implants). However, recently the presence of crystalline defects (called ‘spherulite’) has been observed in this alloy and it now appears essential to know the actual 3D distribution of spherulites in the manufactured parts. Indeed, we believe there is a critical spherulite diameter beyond which the parts break prematurely with a fully brittle behavior.. This synchrotron experiment should give us elements to rule on the influence of spherulites on mechanical strength and they should give us clues as to the cooling rates to be reached or the heat treatment to control their size/distribution. This study is intended to overcome the technical barriers to the development of this grade for the manufacture of implants on an industrial scale.

块体金属玻璃（Bulk Metallic Glass, BMG）Ti40Cu36Zr10Pd14牌号已被证实具备极高的生物医学应用潜力[1],[2]，主要用于牙科种植体的制备。然而近期研究发现，该合金中存在一种被称为‘球晶（spherulite）’的晶体缺陷，如今明确已制造构件内部球晶的真实三维分布已成为亟需解决的关键问题。我们推测存在某一临界球晶直径，当球晶尺寸超过该临界值时，构件会以完全脆性的方式过早断裂。本次同步辐射实验将为我们评估球晶对材料机械强度的影响提供关键依据，同时也将为确定所需的冷却速率，或是通过热处理工艺调控球晶的尺寸与分布提供思路。本研究旨在攻克该合金牌号实现工业规模种植体制造的技术壁垒。