Elastic Modulus of Fe72.5Ga27.5 Magnetostrictive Alloy

• Published in: Chinese physics letters Vol. 27; no. 6; pp. 213 - 216
• Main Authors: Zhu, Xiao-Xi, Liu, Jing-Hua, Jiang, Cheng-Bao
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.06.2010
• Subjects: Bulk modulus; Direct current; Elastic modulus; Magnetic fields; Magnetostriction; Mathematical analysis; Modulus of elasticity; Quenching; 共振频率; 弹性模量; 直流磁场; 磁场测试; 磁致伸缩合金; 第一原理计算; 阻抗测试; 预压应力
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/6/067504

The elastic modulus of Fe72.5Ga27.5 magnetostrictive alloy is determined by testing ac impedance resonance frequency and first-principle calculations. The observed elastic modulus is 90.2 GPa for a directionally solidified sample and 103.4 GPa for a water-quenched sample tested in a dc magnetic field of 32. 7mT without compressive pre-stress. The bulk modulus by first-principles calculation is 179.3GPa which is basically consistent with the experimental result. The elastic modulus first increases and then decreases with increasing dc magnetic field, attributed to magnetostriction occurrence in the Fe72.5Ga27.5 alloy. The elastic modulus increases with increasing compressive pre-stress, resulting from the initial magnetic states change under the applied compressive pre-stress. The elastic modulus increases match well with the improved magnetostriction after quenching.