中文摘要：

铁磁性形状记忆合金Ni-Mn-Ga是一种新型功能材料，它在磁场作用下能产生大的应变。研究了Niso Mn29Ga21Tb1.2室温下的晶体结构和磁感生应变，并用O’Handley的解析模型分析合金产生大磁感生应变的原因是马氏体孪晶在磁场下的迁动。

英文摘要：

Ferromagnetic shape memory alloy Ni--Mn--Ga is a new class of functional material showing large strain under applied magnetic field. This paper studies the crystal structure and the magnetic--field--induced strain of Ni--Mn --Ga alloy and expounds that the reason of large magnetic--field--induced strain is the motion of the martensitic twins with the O＇Handley＇s analytic models.