The aluminium strontium master alloy Al-10Sr has been investigated by in-situ neutron diffraction upon a heating-cooling cycle, revealing composition, crystallographic structure, lattice evolution and linear thermal expansion coefficients. Expansion of the Al matrix between [23.5 … 26.7]·10⁻⁶ K⁻¹ depends on temperature and fits well to the literature values, extrapolating to higher temperature at 800 K. Thermal expansion is highly anisotropic for tetragonal Al₄Sr by a factor of 1.86 with values of 20.8 and 11.1·10⁻⁶ K⁻¹ in a and c-axis. The even larger discrepancy to the Al matrix is prone to residual intergranular phase stresses explaining the brittleness of such composite material. Upon first heating, recovery of the initially plastically deformed material is observed until 600 K and 700 K, for Al₄Sr and Al. Rietveld analysis refines the 4e Wyckoff positions of the I 4/m m m crystal structure to z = 0.39 revealing that local tetrahedrons are regular while local hexagons are stretched, in contrast to literature. Its lattice parameters report to a_I = 4.44240(48) Å, c_I = 11.0836(15) Å at 300 K. Furthermore, the manuscript demonstrates full technical analysis of the neutron data. Findings feed into data bases and an outlook for improving mechanical properties of Al₄Sr composites is given.

铝锶中间合金Al-10Sr在加热-冷却循环中通过原位中子衍射进行了研究，揭示了其组成，晶体结构，晶格演化和线性热膨胀系数。Al基体在[23.5…26.7]·10 ^-6 K ^-1之间的膨胀取决于温度，并且与文献值非常吻合，可以推断为800 K时的较高温度。对于四方Al ₄ Sr，热膨胀是高度各向异性的1.86 20.8和11.1的值·10 ^-6 ķ ^-1在一个和ç-轴。与Al基体的甚至更大的差异易于产生残余的晶间相应力，从而解释了这种复合材料的脆性。第一次加热后，观察到最初塑性变形的材料恢复到Al ₄ Sr和Al达到600 K和700K 。Rietveld分析将I 4 / mmm晶体结构的4e Wyckoff位置细化为z  = 0.39，这表明与文献相反，局部四面体是规则的，而局部六角形是拉伸的。其晶格参数来报告一个_我= 4.44240（48）A，Ç_我在300 K时= 11.0836（15）Å。此外，手稿演示了对中子数据的完整技术分析。将发现结果输入数据库，并给出了改善Al ₄ Sr复合材料机械性能的前景。