edit navigation system

hi…
i have this code in my theme for navigation and is ok but i want to add ‘orderby’ => ‘title’, and is not working why??

<?php $auto_load_same_cat= ot_get_option('auto_load_same_cat');

				if($auto_load_same_cat=='1'){?>
                    <div class="player-button">
                        <div class="prev-post same-cat"><?php next_post_link('%link','<i class="fa fa-chevron-left"></i>',TRUE,'') ; ?></div>
                        <div class="next-post same-cat"><?php previous_post_link('%link ','<i class="fa fa-chevron-right"></i>',TRUE,''); ?></div>
                   </div>
                    <?php
				}else
				 if($auto_load_same_cat=='0' || $auto_load_same_cat=='' ){?>
                     <div class="player-button">
                     <?php
                        $test = "";
                        $posttags = get_the_tags();
                        if ($posttags) {
                        foreach($posttags as $tag) {
                            $test .= ',' . $tag->slug;
                        }
                        }
                        $test = substr($test, 1);
                     $args = array(
                        'post_type' => 'post',
                        'post_status' => 'publish',
                        'tag' => $test,
                     );
                     $current_key = $next = $previous= '';
                     $tm_query = get_posts($args);
                     foreach ( $tm_query as $key => $post ) : setup_postdata( $post );
                        if($post->ID == get_the_ID()){$current_key = $key;}
                     endforeach;
					 $id_pre = ($tm_query[$current_key+1]->ID);
					 $id_nex = ($tm_query[$current_key-1]->ID);
                     if($id_pre!= ''){$next = get_permalink($tm_query[$current_key+1]->ID); }
                     if($id_nex!= ''){$previous = get_permalink($tm_query[$current_key-1]->ID);}
                     ?>